When to Plant Beets in Denver, CO
Published: April 24, 2026
Beet Planting Dates for Denver, CO
| Start seeds indoors | Year-round |
| Last frost (average) | March 30 |
| Direct sow outdoors | March 2–12 |
| Minimum soil temperature | 40°F |
| Expect first harvest | April 21 – May 11 |
| Fall crop planting | September 6–16 |
| Fall crop harvest | October 26 |
| First fall frost (average) | November 1 |
⚠ 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.
Best Beet Varieties for Denver, CO
Consult a Denver-area nursery or your state extension office for beet varieties proven in Zone 6a.
Growing Beets in Denver
Denver sits in Zone 6a, with an average last frost of March 30 and first fall frost around November 1 — giving a 216-day frost-free growing season. Cool-season crops like beet benefit from Denver's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Denver's moderate climate supports beet on the standard transplant calendar with minimal special accommodation. Succession planting — sowing fresh seeds or setting new transplants every 2–3 weeks through spring — stretches the harvest window and gives you a backup crop if pests hit the first planting.
Denver's well-draining loam soils are among the best for beet growing — focus on annual organic matter additions (2 to 3 inches of compost) and consistent moisture during drier months. Water beet at 1 inches per week; loam holds moisture evenly without the drought-crack cycle of heavy clay or the rapid-drain losses of pure sand.
Beet Calendar for Denver
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| March | Direct sow seeds into warm soil |
| April | Expect first harvest window to open |
| September | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Beet Tips for Denver 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.
- •Succession plant beet in Denver every 2–3 weeks through spring to extend the harvest window into summer.
Common Beet Pests in Denver
- •Leaf Miner — peaks July in Zone 6a (active May–September); winding white trails in leaves; remove affected leaves and use row covers.
- •Flea Beetle — peaks July in Zone 6a (active May–September); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Aphid — peaks July in Zone 6a (active May–September); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Beets in Denver
In Denver's moderate climate, Onion and Garlic are the most beneficial plants to grow alongside beet. Onion deters carrot fly, aphids, and several root-zone pests through sulfur compounds. Keep beet away from Pole Bean — it competes for nutrients or shares pest pressure.
Frequently Asked Questions
When should I plant beet in Denver, CO?
In Denver (Zone 6a), direct sow beet around March 2–12. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Denver, CO for beet growing?
Denver is USDA Zone 6a. For beet, this means a frost-free growing season of roughly 31 weeks running from March 30 to November 1. Cool-season crops like beet thrive in this zone with both spring and fall planting windows available.
When is beet harvest season in Denver?
Expect the first beet harvest in Denver around April 21, with harvest continuing through May 11. This is based on 50–70 days from transplant or direct sow. A fall crop planted September 6–16 adds a second harvest around October 26.
How long does it take to grow beet in Denver, CO?
From transplant or direct sow to first harvest, beet takes 50–70 days in Denver's climate. Based on a typical planting date of March 2–12, expect your first harvest around April 21. Denver's Zone 6a transition-zone climate produces maturity times right in the middle of the stated range.
What soil does beet need in Denver?
Denver's loam soil is near-ideal for beet. Work in 2–3 inches of compost before planting to boost organic matter and nutrient content. Minimal amendment is needed beyond that — loam holds moisture evenly without the drought-crack cycle of clay or the nutrient-loss issues of sandy soil.