Updated at: 26-10-2022 - By: Sienna Lewis

If you know when to start growing vegetables in a greenhouse, you can have a year-round productive vegetable garden from February. The most major benefit of greenhouse farming is that you can start growing from the beginning of the year until the end of the year.. Even in the dead of winter, if you have a heated greenhouse, you can grow veggies year round.

If you want to grow vegetables in a greenhouse, you need to understand the seasons and divide crops into hardy, winter and summer crops. As a bonus, knowing your state’s planting zones will help you choose which plants are hardy enough to thrive in your area. Zone 1a has annual temperatures ranging from -60 to -55 degrees Fahrenheit, whereas zone 13b has temperatures ranging from 65 to 70 degrees Fahrenheit.

How To Know When To Start Growing Vegetables In A Greenhouse

In places like Colorado, where the climate is mild year-round, you can start growing veggies in a greenhouse as early as February. If you know your planting zone and forecast weather conditions, you’ll know when to begin growing veggies in your area. With the help of a greenhouse, you’ll be able to fine-tune the inside conditions.

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Classify vegetables

Hardy vegetables

Even in a greenhouse, winter planting is dangerous, although robust, frost-resistant crops can be started in December or January. Vegetables that can resist a hard frost were also listed by Oregon gardeners. Beets, spinach, leeks, kale, turnips, carrots, radishes, Brussels sprouts, and Swiss chard are some of the most common cold-tolerant plants.

The best time to start transplanting frost-tolerant crops is in February or March after they have been hardened off by gradual exposure to external conditions. Even in January, bulb onions can be transplanted. Semi-hardy vegetables can also be grown in a greenhouse in the cooler months.

Cool-season vegetables

In the greenhouse, you can start planting broccoli, cauliflower, cabbage, and lettuce as early as the first week of March. Light frost will not harm parsley and celery. April is the ideal time to harden off and transplant these crops.

Planting a second crop of cool-season vegetables in July and August before transplanting them later in the month and in September is an option if you live in a temperate climate. This will get them ready for the changing weather in the fall. In addition, they can be harvested from now until early spring of the following year.

Warm-season vegetables

In the months of March and April, the greenhouses can be bustling with warm-season crops including tomatoes, squash, eggplant, beans, peas, cucumbers, peppers, and maize. The middle of April or the beginning of May is optimal for these crops because certain places can experience frost well into spring. Check the greenhouse temperature before planting warm-season veggies, as they can’t withstand low temperatures.

Know your seasons

Late winter to mid-spring

From late winter until early spring, you can begin growing hardy plants in the greenhouse. Sow some other plants at the same time in a heated propagator. In the middle of spring, you can also seed sensitive, fast-growing veggies.

Late spring to late-summer

Late spring to early summer is the best time to plant summer vegetables, and then you can harden them after the frost. By mid-summer, you’ll be able to harvest summer crops and remove cucumbers that have wilted and become unappealing. In the greenhouse, you can start a new crop of lettuce, baby carrots, and salad leaves as early as the end of the summer.


Some herbs and vegetables, such as parsley and calabrese, can be started indoors in the fall. Overwintering crops like peas are also ideal. Leafy greens and cruciferous vegetables can be planted in Maine as early as August, even in the fall.

Is Year-Round Greenhouse Planting Possible?

It is feasible to grow year-round in greenhouses since you can manage the interior environment for your vegetables. It’s possible to plant cold-tolerant crops in February without the use of additional lights in Colorado. The ideal place to start most plants until they can be transplanted outside is a greenhouse.

Around March or April, you can sow warm-season crops and harvest cold-tolerant ones. When it comes to leafy greens, May is also a good time to harvest them and transplant the crops you began indoors. Still, it’s a good idea to have a cooling system in place for June and July crops to avoid overheating.

As the days get shorter in November and December, it may be necessary to use extra lighting for winter gardening. Ideally, your plants should be fully mature by November or December so that you can continue harvesting throughout the winter. You may be able to shield your crops from frost in the winter by using a greenhouse.

What are the Easiest Vegetables to Grow in a Greenhouse?

There are a variety of crops that can be grown in a greenhouse according on when it is. Carrots, Brussels sprouts, winter squash, cabbage, and potatoes are some of the greatest veggies to plant in the winter. On the other side, radishes, spinach, broccoli, and asparagus are the best spring veggies to cultivate.

Zucchini, cucumbers, maize, and tomatoes are some of the summer veggies that can be grown in the garden. Mushrooms, kale, onions, and bell peppers are good fall vegetable choices.

How Do You Grow in a Greenhouse?

Choosing veggies that do well in the same conditions, using the correct containers and soil, and maintaining environmental control are all critical to year-round greenhouse gardening success.

Pick out vegetables that you want to grow each season

The first step in starting plants in a greenhouse is deciding what vegetables you want to raise each season. Select your favorite vegetables first, and then sort them into groups based on the way they grow best. You should grow vegetables that thrive in comparable climatic conditions so that you can better manage the temperature, lighting and watering, as well as the humidity levels in your garden.

Select the right containers and soil

The containers and soil you use to cultivate your vegetables will depend on the plants you’ve chosen to produce. For your vegetables, remember that they need a lot of room in your containers. Check to see if the containers you’re looking at can be used to drain water as well.

Finally, the type of vegetable you wish to cultivate will determine the container you use. You must also decide if you want to grow this food in a pot or straight in the ground.

It’s great if you grow your crops in soil that is rich and fertile. Compost-mixed soil is highly recommended by gardening experts since it not only adds nutrients to the soil, but it also insulates your plants from the cold of winter.

Growing Vegetables in a Greenhouse - Harvesting Tomatoes - One Hundred Dollars a Month

Learn to control and monitor the growing environment

Your plants’ growing conditions should be adjusted according to seasonal changes in lighting, temperature, humidity, and watering frequency.


During the summer, for example, you can forego using your lighting system because the sun will provide more than enough light. However, if you want your plants to thrive, you’ll need to turn this on in the fall and winter.

It’s better to set your plant kids in regions where they can get the most sunlight, even if it’s cloudy, because that’s what they need to thrive. You may save money by installing warming lights and LED lights in your greenhouse if you wish to add more lighting.


Use a thermometer in your greenhouse that can measure both the temperature inside and outside of your enclosed space. Temperature data will allow you to adjust the temperature in your greenhouse to suit your plants’ needs.

When it’s hot outside, you’ll want to run your air conditioning or open the vents in your greenhouse to keep it cool. In the winter, you may need to insulate or utilize electric heat if the temperature drops too low.


To avoid having to provide your vegetables with the amount of humidity they’d require if you reside in a location that sees dry weather most of the time, try growing plants that can survive in this type of climate. If you didn’t know, spraying your greenhouse is a simple technique to raise the humidity level. You can tell if your plants need more or less humidity by feeling the moisture on them.


In the summer, it’s evident that you’ll need to water your vegetables more frequently. An automated watering system that you may modify as needed would make this task a lot simpler for you.

You should learn how to tell when to water your plants less or more if you opt to do it by hand. You can tell if the soil is still wet by looking at it. You don’t need to water the plant any longer if dirt particles stick to your finger after you touch it.

The Conclusion After Knowing How to Grow Vegetables in a Greenhouse Year-Round

The ability to grow veggies year-round in a greenhouse is essential if you want to get the most out of your area. Greenhouse gardening has several advantages that you should not overlook! Use your garden to its full potential!

How to Grow a Greenhouse Vegetable Garden

When you grow your own food, you receive the freshest produce. Vegetable greenhouses allow farmers to extend their harvest beyond the traditional “growing season,” which runs from spring to fall. Temperature, water, humidity, and light are all under the control of a greenhouse. The temperature and location of your garden greenhouse have an impact on the types of vegetables you can grow there. Choosing the correct veggies to grow in a greenhouse is critical to the overall performance of the greenhouse plants.

Choosing a Greenhouse and Site

Your garden size and the sort of greenhouse you intend to build or purchase can help you determine the best location for your vegetable greenhouse. An ideal setting for a greenhouse is one where humidity is low, temperatures are temperate, and there is plenty of natural light, as described by New Mexico State University. Greenhouse kits, which come with instructions, may be purchased online and installed by novices, reports Fine Gardening.

Fine Gardening goes on to explain that greenhouses can either be free-standing or linked to another building. Large solar greenhouses, usually freestanding structures erected in the open air, necessitate a lot of room and exposure to the light from all directions. You can construct a small greenhouse against your home’s insulated north brick wall or dig a solar pit greenhouse underneath. The roof is made of either plastic or glass.

Maintaining your Greenhouse

Provide a supply of water for crops. Watering cans or a hose from a faucet pail be used depending on where your greenhouse is located. Home-built greenhouses can utilize black-painted plastic milk jugs filled with water to boost humidity and heat production.

According to New Mexico State University, the greenhouse’s cover should be made of either glass or plastic to withstand heavy rain and snow. Incoming light is diffused and absorbed by double-glazed glass windows. It is possible to save money and weight by using plastic coverings made of materials like fiberglass, polyethylene, vinyl, acrylic, or polycarbonate. However, these materials can break easily and allow heat to escape.

Planning your Vegetable Garden Greenhouse

Decide which vegetables to plant in your greenhouse. In a greenhouse, “cold season” vegetables, such as broccoli and lettuce, thrive in temperatures between 50 and 70 degrees Fahrenheit during the day and 45 to 55 degrees Fahrenheit at night. Hot direct sunlight is not necessary for “cool season” crops.

Choose the crops that you want to cultivate in your greenhouse. In a greenhouse, “cold season” vegetables, such as broccoli and lettuce, thrive in temperatures between 50 and 70 degrees Fahrenheit during the day and 45 to 55 degrees Fahrenheit at night. “Cool season” crops don’t necessitate hot, direct sunlight.

Growing Vegetables in a Garden Greenhouse

Choose the crops that you want to cultivate in your greenhouse. With daily temperatures between 50 and 70 degrees Fahrenheit and nighttime temperatures between 45 and 55 degrees Fahrenheit, “cold season” vegetables, such as broccoli, lettuce, and spinach, grow best in a greenhouse. “Cool season” crops don’t necessitate hot, direct sunlight.

Choose the veggies you want to cultivate in your greenhouse. With daily temperatures between 50 and 70 degrees Fahrenheit and nighttime temperatures between 45 and 55 degrees Fahrenheit, “cold season” vegetables, such as broccoli, lettuce, and spinach, grow best in a greenhouse. During the “cold season” crops, direct sunlight is not required.

Tips for Vegetable Greenhouse Success

Decide which vegetables to plant in your greenhouse. In a greenhouse, “cold season” vegetables, such as broccoli and lettuce, thrive in temperatures between 50 and 70 degrees Fahrenheit during the day and 45 to 55 degrees Fahrenheit at night. For “cool season” crops, direct sunlight is not required.

Before you buy or build a greenhouse, think about how you’ll use it. You might want to utilize it for year-round gardening or to lengthen the harvest season. Brick walls can absorb up to 35% of the sun’s heat if your greenhouse is attached to your house. Plants can be sown straight into the ground if you are building a pit greenhouse. A watering system may be available for purchase and installation depending on the sort of vegetable greenhouse you are utilizing.

A greenhouse in the shade is a bad idea. If you want to hydrate your garden with disposable milk jugs, keep an eye out for leaks. As a final point, both glass greenhouse window coverings and plastic greenhouse window coverings can be damaged. Protecting your greenhouse and having a long vegetable harvest are both possible with a little forethought.

What is the disadvantage of the greenhouse?

A greenhouse’s drawbacks include the fact that it might be expensive to heat. Continuous monitoring, maintenance and care is required. Electricity and water expenses may rise as a result. A garden’s visual attractiveness may be diminished as a result.

When should I start plants in my greenhouse?

You can start seedlings in greenhouses at any moment due to the controlled atmosphere. It’s best to plant seeds in greenhouses six to eight weeks before your area’s last projected frost date if you plan on transplanting them into gardens outside in the spring.

Growing Vegetables in a Greenhouse - One Hundred Dollars a Month

Do vegetables grow better in greenhouses?

Gardeners may make the most of the sun’s energy by installing a greenhouse on their food allotment. Vegetable gardeners can extend their growing season by using even the smallest, unheated structures.

Can you grow asparagus in a greenhouse?

Using trays with 38 to 84 cells, our team was able to establish healthy and vigorous asparagus transplants in the greenhouse in 10 to 12 weeks.

What vegetables grow best in greenhouses?

Peppers are one of the best crops to grow in a greenhouse. Because they grow naturally in hotter regions, practically all pepper cultivars are excellent choices for greenhouse cultivation. … Fruits and vegetables include: Tomato, Cucumber, Cucumber, Root, Vegetable, Sweetcorn, Squash, Brussels sprouts, and Calabrese/Broccoli

What can I grow in a small greenhouse for beginners?

Tomatoes, peppers, cucumbers, and aubergines can be grown in the Mini greenhouse during the Summer months. The space left over when other plants are planted might be used to cultivate Mediterranean crops at home.

Do plants grow faster in a greenhouse?

In a greenhouse, plants develop faster and better because the temperature is more controlled and the carbon dioxide level is higher than in the outside environment.

Does a greenhouse need to be in full sun?

It’s important to place your greenhouse in an area that gets a lot of sunlight, natural light, and is shielded from harsh winds and frost pockets so that your plants and seedlings have the best chance of survival. Due to inadequate drainage and lack of sunlight, some gardens have parts that are moist or susceptible to surface water.

Should I water tomatoes every day?

Morning watering of plants is a good habit to get into early in the growing season. The need to water tomato plants twice a day may grow as the temperature rises. As a rule of thumb, you’ll need to water your garden tomatoes once or twice a week. It’s time to water again if the soil feels dry about an inch below the surface.

How do you grow asparagus in a greenhouse?

A mound should be formed in the trench and crowns should be planted 15 to 18 inches apart. The roots should be spread out over the ridge. Apply 2 inches of dirt to the roots and crowns, then thoroughly water them. Leaving 3 to 4 inches of the stems exposed, fill in the trench with soil as the stems grow.

Should a greenhouse be in full sun?

It’s important to place your greenhouse in an area that gets a lot of sunlight, natural light, and is shielded from harsh winds and frost pockets so that your plants and seedlings have the best chance of survival. Due to inadequate drainage and lack of sunlight, some gardens have parts that are moist or susceptible to surface water.

Can I grow tomatoes year round in a greenhouse?

When you have a greenhouse, you don’t have to wait for the summer months to grow your favorite tomatoes. Despite their finicky nature, everyone should be able to grow their own year-round supply of these mouthwatering delicacies with a little practice and patience.

What vegetables can you grow year round in a greenhouse?

Before you begin, choose your vegetables. Winter vegetables to grow include Brussels sprouts, carrots, cabbage, potatoes, and winter squash. Asparagus, radishes, spinach, and broccoli are all in season now. The fruits and vegetables of the summer mushrooms, onions and peppers in a dish of fall kale

How do you start a greenhouse for beginners?

Introduction to Greenhouse Gardening for Complete Newbies Be a seed savant. ‘ You should make a list of the plants you want to grow. Containers are an investment. Prevent plant illnesses and pest infestations by using sterile soil. Add some fertilizer to your soil to improve the quality of it. Always follow the manufacturer’s instructions on how much water to give your plants.

Where is the best place to plant asparagus?

Asparagus must first and foremost be planted in full sun. A location with at least eight hours of direct sunlight every day is ideal. Asparagus can tolerate little shade, but it prefers full sun. Soil quality must also be taken into account prior to planting, in addition to getting enough sunlight.

Is a greenhouse worth it?

Are Greenhouses a Good Investment? Yes, a greenhouse is worth the investment if you’re asking the question in the first place. In a greenhouse, you have a year-round growing environment for plants and vegetables. Even if you have to fork over a few bucks, you’ll reap the benefits in the end.

What is the best way to grow vegetables in a greenhouse?

Place the seeds or vegetables in pots that are about two-thirds full of soil. Keep the tallest plants in the back of the greenhouse and give plenty of room between them. Because this is an indoor garden, your crops will not be able to benefit from rain, you should water them as needed.


Greenhouse gardening has the greatest advantage of allowing year-round production. However, do you know when to begin cultivating veggies in a greenhouse? Sowing or planting can begin as early as February in states like Colorado.

You can plant in the greenhouse regardless of the weather conditions if you know your planting zone, the seasons, and the crop classifications. While certain vegetables can be started indoors, others can be protected from frost by using a greenhouse.