When should you plant a garden in Colorado
Andrew White
Published May 17, 2026
With the Colorado growing season averaging only 157 days, “when to plant” is a critical question. We suggest planting all of your cold season crops in April. Planting the first week of April is great, but cold crops can be planted anytime in April or even May.
When should I start my garden in Colorado?
When to plant in Colorado Cool-weather seeds can be started inside now through the end of the month. Depending on the cold tolerance of the plant, they can be sown outside starting in mid-to-late March. Warm-weather seeds should be started in mid-March. Many Coloradans remember St.
When should I start planting my vegetable garden?
The Best Time to Plant Your Garden For most of the United States, the best time to start spring crops is, well, now. But to get more exact planting recommendations based on your area, use this handy calendar. (As a general rule, you should plant hardy greens and cole crops a few weeks before your final frost.)
What can I plant right now in Colorado?
Brussel sprouts, broccoli, cauliflower and cabbage are good crops to plant now, too, along with radishes, beets and peas.When can I plant tomatoes in Colorado?
Tomato transplants should go into the ground after the danger of frost has past. Night temperatures should be in the low- to mid-40s at the lowest, with daytime highs at least in upper 50s. But be forewarned: A week of cool daytime temps (below 55) can stunt plants and reduce yields.
How late can you start a garden?
The latest time to plant for most vegetables would be the second week in June with a short harvest time. If planting crops that mature within 50 days, you could plant those as late as the last week in June, but keep in mind the weather will be turning cooler, especially at night. Cool crops are best for late plantings.
What can I plant in April in Colorado?
- Early in the month, plant broccoli, cabbage, cauliflower and other cool-season seedlings.
- Direct-sow peas, radishes, lettuce, salad greens, spinach and onions.
- Plant asparagus and rhubarb.
- Plant hardy herbs, such as dill, parsley or chives.
What vegetables grow well in Colorado?
- Broccoli.
- Brussels sprouts.
- Cabbage.
- Collards.
- English Peas.
- Kale.
- Lettuce.
- Mustard.
What can I plant in May in Colorado?
Plant onions, peppers, and tomatoes in May. Beans, Brussels sprouts, corn, and cucumbers go in the ground in June, and squash in July. Early crops have a second season in September.
How do you grow cucumbers in Colorado?Plant five or six seeds together in hills 4 to 6 feet apart. Cover the seeds with about 1 inch of soil. After emergence, thin each hill to the two or three strongest seedlings. Cucumbers can be planted next to fences or trellises, to which they will cling.
Article first time published onIs it OK to plant vegetables now?
The experts at Fine Gardening recommend planting warm season crops like peppers and tomatoes after the threat of frost is past. Keep an eye on the weather reports, and wait until the night temperatures are steady at 50 to 55 degrees Fahrenheit or higher.
When should I start planting tomatoes?
Tomatoes run on warmth; plant in late spring and early summer except in zone 10, where they are a fall and winter crop. For a head start on growing, plant starter plants instead of seeds.
What can I plant outside now?
- Onions. I’m not saying that it’s easy to grow onions from seed – in fact it’s much simpler to plant sets (tiny bulbs) in spring or autumn. …
- Microleaves. …
- Broad beans. …
- Chillies. …
- Baby carrots. …
- Also worth a try. …
- Not worth sowing till much later.
What kind of tomatoes grow best in Colorado?
- Roma. Roma. …
- Rutgers. Rutgers. …
- San Marzano Gigante. San Marzano Gigante. …
- Shady Lady. Shady Lady. …
- Sun Gold. Sun Gold. …
- Sweet 100. Sweet 100. Hybrid I determinate. …
- Yellow Pear. Yellow Pear. F Hybrid determinate. …
- Yellow Plum. Yellow Plumb. Indeterminate.
Should I water tomatoes every day?
Early in the growing season, watering plants daily in the morning. As temperatures increase, you might need to water tomato plants twice a day. Garden tomatoes typically require 1-2 inches of water a week. … If soil feels dry about 1 inch below the surface, it’s time to water again.
When should I plant tomato seeds in Colorado?
TOMATOES & PEPPERS – Start seeds indoors anytime in the last two weeks of March (about 6-8 weeks before the final frost). Transplant tomatoes outside anytime after May 15th, after danger of frost has passed.
What is considered early spring in Colorado?
This year, the vernal equinox, which signals the beginning of spring, occurs at 9:50 p.m. on Thursday, March 19, in Colorado. The last time the vernal equinox occurred this early was 124 years ago.
What is the growing season in Colorado?
Annual plants are grown for one outdoor season, anytime from early spring to late fall or the first fall frost. Perennial foliage and blooming plants return each year, but many require cutting back the wintered-over dead foliage at the beginning of the new outdoor season in early spring.
What can I plant in March in Colorado?
Direct sow in ground cool season (hardy) crops such as arugula, lettuce, spinach, peas, and kale beginning mid-March through the end of April. Start warm season crops (tender) such as tomatoes, peppers, and eggplant indoors at the end of the month for transplant mid-late May.
Is it too late to start a garden in April?
The answer is usually no, it’s not too late! Generally speaking, April and May are the best time to start a vegetable garden. … Most vegetables have a maturation date of 50 to 75 days.
How do I start a garden in Colorado?
- Amend soil with manure and compost to increase fertility, drainage, and fluffiness.
- Allow potted vegetables to acclimate to the outdoor environment for a day or two before transferring to the garden.
- Plant at the recommended ground depth for any given crop.
- Water plants at ground level.
Is it too late to plant vegetables in May?
May is not too late to plant as many different varieties as possible! They come small, big, hot, mild, and an array of different colors. Summer Squash (Zones 3-10): Sow summer squash now in May so that you will fresh and tasty squash and zucchini for July!
When can I plant lettuce in Colorado?
If you want to grow from lettuce transplants, start seeds indoors in early spring. Plants take 4 weeks to reach transplant size. Time the planting before the last average frost date for a spring harvest. A fall harvest can be planted in mid-to-late summer.
When should I fertilize my plants in Colorado?
The best time to fertilize trees in Colorado There are two prime times of year to fertilize your trees in Colorado: late spring and late fall before the first major snowstorm. The most effective tree fertilizing takes place in the spring and fall after trimming.
What can I plant in summer Colorado?
Crops that can be planted until mid-July include cabbage, collards, endive, green onions, New Zealand spinach, bush beans, cucumber, cauliflower, edible-podded peas and summer squash.
What are the easiest vegetables to grow in Colorado?
- Leafy Greens (micro greens, chard, kale, mustard, etc.)
- Beans.
- Tomatoes.
- Basil.
- Root Crops.
What garden zone is Colorado?
Surrounding areas are in zone 6. The majority of the Front Range is in zone 5. But if you live in the heart of an urban corridor — like certain parts of Colorado Springs, Denver, Aurora and Boulder — you may be in zone 6a.
How do I start a vegetable garden in Colorado?
- Cover the soil with black plastic and/or mulch to help keep it warm.
- Use raised beds.
- Plant frost-tolerant veggies early.
- Plant cool-weather crops as soon as soil temperatures allow.
When can I plant zucchini outside Colorado?
CropBased on Frost Dates Based on Moon DatesStart Seeds IndoorsStart Seeds OutdoorsTurnipsN/AApr 11-May 2 Apr 17-29WatermelonsApr 11-18 Apr 11-16N/AZucchiniApr 11-25 Apr 11-16N/A
Can you grow pumpkin and cucumber together?
You can plant pumpkins next to other squash, melons and cucumbers. … The female flower of the plant will only accept pollen from closely-related members. So a squash and cucumber cannot cross pollinate. But an acorn squash can cross with the more closely related zucchini or gourd.
How do you grow peppers in Colorado?
Plants can be grown by sowing seeds in a prepared potting soil 1/2 inch deep at 80 degrees F until seedlings emerge. As soon as seedlings begin to crowd, transplant the plants into pots or cell packs and grow at 70 degrees by day and 60 degrees at night.