Spring in Colorado calls for quick-maturing vegetables like radishes and peas before summer heat arrives. Choosing the best vegetables to grow in colorado spring means focusing on crops that thrive in cool soil, tolerate late frosts, and finish before the intense sun dries everything out. Your garden window is short but productive if you pick the right plants and plant them at the right time.
Colorado spring weather is unpredictable. You might get snow in April and 80-degree days in May. That is why cold-hardy, fast-growing vegetables are your best bet. Think leafy greens, root crops, and legumes that can handle a light freeze and still produce well.
This guide covers the top vegetables for a Colorado spring garden. You will learn what to plant, when to plant it, and how to care for each crop. Let’s get your garden started on the right foot.
Best Vegetables To Grow In Colorado Spring
The best vegetables to grow in colorado spring share three traits: cold tolerance, quick maturity, and shallow root systems. These plants can germinate in soil as cool as 40°F and produce a harvest in 30 to 60 days. Below are the top performers for your spring garden.
Radishes
Radishes are the fastest crop you can grow. They mature in 25 to 30 days from seed. Plant them as soon as the soil can be worked, usually in March or early April. They tolerate light frost and even snow.
- Varieties: Cherry Belle, French Breakfast, White Icicle
- Plant depth: ½ inch
- Spacing: 1 inch apart, rows 6 inches apart
- Harvest: Pull when roots are 1 inch in diameter
Radishes do not like heat. If temperatures spike, they become woody and bolt. Plant successive crops every two weeks until late April for a continuous harvest.
Peas
Peas love cool weather. They germinate in soil as cold as 40°F and produce sweet pods before summer heat arrives. Plant them in early spring, around St. Patrick’s Day in many Colorado regions.
- Varieties: Sugar Snap, Oregon Sugar Pod II, Little Marvel
- Plant depth: 1 inch
- Spacing: 2 inches apart, rows 18 inches apart
- Support: Use trellises for climbing varieties
Peas stop producing when temperatures exceed 80°F. Mulch around the base to keep roots cool. Harvest pods when they are plump and bright green.
Spinach
Spinach is a cold-hardy green that thrives in Colorado springs. It can survive temperatures down to 20°F with some protection. Plant seeds directly in the ground as soon as the soil thaws.
- Varieties: Bloomsdale, Space, Tyee
- Plant depth: ½ inch
- Spacing: 2 inches apart, rows 12 inches apart
- Harvest: Pick outer leaves when 3 inches long
Spinach bolts quickly in long days and heat. Plant in partial shade if possible. Succession plant every two weeks for a longer harvest window.
Lettuce
Lettuce is a spring staple. It grows fast and can be harvested as baby greens or full heads. Choose leaf varieties for the quickest results.
- Varieties: Black Seeded Simpson, Red Sails, Buttercrunch
- Plant depth: ¼ inch
- Spacing: 6 inches apart for full heads, 2 inches for baby greens
- Harvest: Cut leaves at 4 to 6 weeks
Lettuce needs consistent moisture. Water deeply and regularly. Use row covers to protect against late frosts and pests like aphids.
Kale
Kale is extremely cold-hardy. It can survive snow and frost, and it actually tastes sweeter after a freeze. Plant it early and harvest leaves throughout spring.
- Varieties: Lacinato, Red Russian, Winterbor
- Plant depth: ½ inch
- Spacing: 12 inches apart, rows 18 inches apart
- Harvest: Pick outer leaves from the bottom up
Kale grows slowly in cold soil but speeds up as temperatures rise. Keep it well-watered to prevent bitterness. It will last until the heat of June forces it to bolt.
Carrots
Carrots take longer than radishes but are worth the wait. They germinate best in cool soil and develop sweet flavor in spring conditions. Plant them early, but be patient—germination can take up to three weeks.
- Varieties: Nantes, Danvers, Scarlet Nantes
- Plant depth: ¼ inch
- Spacing: 2 inches apart, rows 12 inches apart
- Harvest: 60 to 75 days, when roots are ½ inch thick
Carrots need loose, sandy soil. Rocky or clay soil causes forked roots. Water consistently to keep the soil moist but not soggy.
Beets
Beets are dual-purpose crops. You can eat the roots and the greens. They grow well in cool spring soil and tolerate light frost.
- Varieties: Detroit Dark Red, Golden, Chioggia
- Plant depth: ½ inch
- Spacing: 3 inches apart, rows 12 inches apart
- Harvest: 50 to 70 days, when roots are 1 to 2 inches
Beets need consistent moisture for tender roots. Thin seedlings to avoid crowding. Harvest greens when they are 4 to 6 inches tall.
Turnips
Turnips are fast and forgiving. They mature in 30 to 60 days and produce both roots and greens. Plant them early for a spring harvest.
- Varieties: Purple Top White Globe, Hakurei
- Plant depth: ½ inch
- Spacing: 4 inches apart, rows 12 inches apart
- Harvest: Pull when roots are 2 to 3 inches
Turnips become woody if left too long. Harvest promptly. The greens are edible and nutritious.
Swiss Chard
Swiss chard is a colorful, heat-tolerant green that also does well in cool spring weather. It is more resilient than spinach and produces for weeks.
- Varieties: Bright Lights, Fordhook Giant
- Plant depth: ½ inch
- Spacing: 6 inches apart, rows 18 inches apart
- Harvest: Cut outer leaves at 6 inches tall
Chard can handle light frost. It will keep growing into early summer. Water regularly to keep leaves tender.
Broccoli
Broccoli is a cool-season crop that forms heads in spring. It needs consistent cool temperatures to develop properly. Plant transplants in early spring for best results.
- Varieties: Green Goliath, Calabrese, De Cicco
- Plant depth: Set transplants at same depth as pot
- Spacing: 18 inches apart, rows 24 inches apart
- Harvest: Cut central head when tight and dark green
Broccoli bolts quickly in heat. Mulch and water well. After cutting the main head, side shoots will form for a second harvest.
Cauliflower
Cauliflower is trickier than broccoli but still possible in Colorado spring. It needs consistent cool temperatures and plenty of water.
- Varieties: Snow Crown, Early Snowball
- Plant depth: Set transplants at same depth as pot
- Spacing: 18 inches apart, rows 24 inches apart
- Harvest: Cut when heads are 6 to 8 inches and tight
Blanch cauliflower by tying outer leaves over the head to keep it white. Harvest before the curds separate.
Potatoes
Potatoes are a spring crop in Colorado. Plant seed potatoes in early April for a summer harvest. They tolerate cool soil and light frost.
- Varieties: Yukon Gold, Red Norland, Russet
- Plant depth: 4 inches deep
- Spacing: 12 inches apart, rows 24 inches apart
- Harvest: 70 to 90 days, after plants flower and die back
Hill soil around the stems as plants grow to protect tubers from sunlight. Water consistently for even growth.
Onions
Onions grow well in Colorado spring. Plant sets or transplants in early spring for a summer harvest. They tolerate cold and need long days to bulb.
- Varieties: Yellow Sweet Spanish, Red Burgundy, White Sweet Spanish
- Plant depth: 1 inch deep for sets
- Spacing: 4 inches apart, rows 12 inches apart
- Harvest: When tops fall over and turn brown
Onions need full sun and consistent moisture. Stop watering when tops fall over to cure bulbs.
When To Plant Spring Vegetables In Colorado
Timing is everything in Colorado. The last frost date varies by elevation and region. In Denver, the average last frost is around May 5. In the mountains, it can be late May or early June.
Plant cold-hardy vegetables 4 to 6 weeks before the last frost. That means mid-March to early April for most Front Range gardens. Use a soil thermometer. Plant when soil temperature reaches at least 40°F for peas and radishes, 45°F for spinach and lettuce.
Hardening Off Transplants
If you start seeds indoors, harden them off before planting outside. Set them outside for a few hours each day over a week. Increase exposure gradually. This prevents transplant shock.
Using Row Covers
Row covers protect plants from late frosts and pests. Use lightweight fabric that lets in light and water. Remove covers when temperatures stay above 50°F.
Soil Preparation For Colorado Spring Gardens
Colorado soil is often clay-heavy and alkaline. Spring vegetables prefer loose, well-draining soil with a pH between 6.0 and 7.0. Amend your soil before planting.
Steps To Prepare Soil
- Test soil pH with a home kit. Colorado soil is often 7.5 or higher.
- Add organic matter like compost or aged manure. This improves drainage and adds nutrients.
- Work in sulfur or peat moss to lower pH if needed.
- Remove rocks and break up clods.
- Rake the bed smooth before planting.
Compost is your best friend. Add 2 to 3 inches of compost and till it into the top 6 inches of soil. This provides slow-release nutrients and improves moisture retention.
Watering Tips For Colorado Spring
Colorado is dry. Spring winds dry out soil quickly. Water deeply and less frequently to encourage deep root growth. Shallow watering leads to weak plants.
- Water early in the morning to reduce evaporation.
- Use drip irrigation or soaker hoses for efficiency.
- Mulch around plants with straw or shredded leaves to retain moisture.
- Check soil moisture 2 inches down. If dry, water.
Young seedlings need more frequent watering. Once established, most spring vegetables need about 1 inch of water per week.
Common Pests And Problems
Spring pests in Colorado include aphids, flea beetles, and cutworms. Slugs can be a problem in wet springs. Here is how to handle them.
Aphids
Aphids cluster on new growth. Spray them off with a strong stream of water. Use insecticidal soap if needed.
Flea Beetles
Flea beetles chew small holes in leaves. Use row covers to protect young plants. Apply diatomaceous earth around the base.
Cutworms
Cutworms sever stems at soil level. Place cardboard collars around seedlings. Handpick cutworms at night.
Bolting
Bolting happens when temperatures spike. Plant early and use shade cloth if a heat wave hits. Harvest leafy greens before they flower.
Succession Planting For Continuous Harvest
Succession planting extends your spring harvest. Plant a new batch of seeds every two weeks. This works well for radishes, lettuce, spinach, and peas.
For example, plant radishes on March 15, then again on April 1, and again on April 15. You will have fresh radishes from April through May. Stop planting when temperatures consistently exceed 75°F.
Frequently Asked Questions
What Are The Best Vegetables To Grow In Colorado Spring For Beginners?
Radishes, peas, and lettuce are easiest for beginners. They germinate quickly and require minimal care. Start with these to build confidence.
Can I Grow Tomatoes In Colorado Spring?
Tomatoes are warm-season crops. Do not plant them until after the last frost, usually mid-May. They are not part of the best vegetables to grow in Colorado spring because they need heat.
How Late Can I Plant Spring Vegetables In Colorado?
Most spring vegetables should be planted by mid-April to early May. After that, heat causes bolting and poor quality. Focus on warm-season crops after May.
Do I Need To Fertilize Spring Vegetables In Colorado?
Yes, but lightly. Use a balanced fertilizer like 10-10-10 at planting time. Side-dress with compost or fish emulsion after three weeks.
What Vegetables Grow Best In Colorado’s High Altitude?
Leafy greens, root vegetables, and peas perform well at high altitude. They tolerate cooler temperatures and shorter growing seasons. Choose varieties with shorter maturity dates.
Final Tips For A Successful Colorado Spring Garden
Start small. Plant a few crops your first season. Radishes and lettuce are forgiving and rewarding. Expand as you learn what works in your microclimate.
Keep a garden journal. Note planting dates, weather events, and harvest times. This helps you refine your timing each year.
Join a local gardening group. Colorado gardeners share tips specific to your area. They can tell you when to plant and which varieties perform best.
With the right choices and a little planning, your Colorado spring garden will produce fresh vegetables before summer even begins. Focus on the best vegetables to grow in Colorado spring—radishes, peas, spinach, lettuce, kale, carrots, beets, turnips, chard, broccoli, cauliflower, potatoes, and onions—and you will enjoy a bountiful harvest.
Get your seeds now. Prep your soil. Watch the weather. And plant as soon as the ground is workable. Your spring garden awaits.