When to Plant Beets in Colorado
Published: April 24, 2026
Colorado gardeners in Zone 6a have a 31-week growing season for beet (March 30 to November 1). Colorado's spring and fall windows both work well for beet — some gardeners plant both successions for a long harvest. This guide gives exact dates for Colorado based on your local frost calendar.
Beet Planting Dates for Colorado
| Start seeds indoors | Year-round |
| Last frost (average) | March 30 |
| Direct sow outdoors | March 2–12 |
| Expect first harvest | April 21 – May 11 |
| Fall crop start | September 6–16 |
| Fall harvest | October 26 |
| First fall frost (average) | November 1 |
Dates above assume Zone 6a, the most common zone in Colorado. Gardeners in cooler Denver (Zone 6a) plant 1–2 weeks later; warmer Colorado Springs (Zone 6b) can plant 1–2 weeks earlier.
⚠ Direct sow beets 3–4 weeks before last frost. Each beet seed cluster contains 2–3 seeds — thin to 3 inches. Succession plant every 3 weeks.
Growing Beets in Colorado's Climate
Colorado's moderate Zone 6a climate is well-suited to beet with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your beet harvest significantly in Colorado. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common beet pests to watch for in Colorado include Leaf Miner and Flea Beetle. The first line of defense is companion planting: Onion and Garlic planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Beet Garden Calendar for Colorado
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | — | Dormant season |
| March | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 3 inches apart |
| April | First harvest window opens | Beet begins producing 50–70 days after transplant |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining beet; cover plants on frost nights |
| December | — | Dormant season |
Beet Growing Tips for Colorado Gardeners
- •Soak beet seeds 4 hours before planting to soften the tough seed cluster and improve germination rates.
- •Thin seedlings to 3 inches apart — crowded plants produce tiny woody roots rather than full-sized beets.
- •Colorado's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Use thinnings as baby greens in salads; beet greens are more nutritious than the roots.
Companion Planting for Beets in Colorado
In Colorado's moderate climate, planting beet with Onion and Garlic helps deter pests and improve soil. Avoid planting near Pole Bean and Mustard, which inhibit beet growth through root chemistry or shared pest pressure. See the full beet companion planting guide for the complete list.
Beets Planting Dates by City in Colorado
Top cities in Colorado — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant beet in Colorado?
In Colorado (Zone 6a), start beet seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of March 30.
What is the last frost date in Colorado?
Colorado's average last frost date is March 30 in the state's most common Zone 6a. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow beet year-round in Colorado?
beet is a cool-season crop in Colorado, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What beet varieties grow best in Colorado?
For Colorado's Zone 6a, consult a local nursery or extension office for beets variety recommendations.
When do I start beet seeds indoors in Colorado?
Beet does not need indoor starting in Colorado — direct sow around March 2–12 once soil reaches 40°F. Indoor starting is not recommended for this crop because beet transplants poorly.