When to Plant Carrots in Colorado
Patience is the secret ingredient. Carrots are slow to germinate but deliver sweet, crunchy rewards.
The Short Answer
Colorado Frost Dates
Your planting dates depend on which part of Colorado you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Front Range (Denver) | 5a, 5b, 6a | May 1 - May 15 | Sep 25 - Oct 10 |
| Western Slope | 4b, 5a, 5b, 6a | May 10 - Jun 1 | Sep 15 - Oct 5 |
| Mountain Regions | 3a, 3b, 4a, 4b | Jun 1 - Jun 20 | Aug 25 - Sep 15 |
Carrots Planting Schedule for Colorado
Front Range (Denver) (Zones 5a, 5b, 6a)
Average last frost: May 1 - May 15 · Average first frost: Sep 25 - Oct 10
Western Slope (Zones 4b, 5a, 5b, 6a)
Average last frost: May 10 - Jun 1 · Average first frost: Sep 15 - Oct 5
Mountain Regions (Zones 3a, 3b, 4a, 4b)
Average last frost: Jun 1 - Jun 20 · Average first frost: Aug 25 - Sep 15
Growing Carrots in Colorado
Carrots in Colorado's Climate
Your cold climate grows outstanding carrots — the sandy soils of northern states warm quickly in spring and the cool fall weather concentrates sugars beautifully. Direct sow from mid-April and succession plant every 3 weeks through mid-July. Fall-sown carrots left in the ground under heavy mulch can be harvested fresh through winter — the soil keeps them crisp while the cold keeps them sweet. This is one crop where cold climates have a genuine advantage.
Soil Considerations for Colorado
Alkaline clay soils common along Front Range. Rocky, thin soils in mountains. Amend heavily with compost and sulfur to lower pH. Loose, well-drained soil is especially important for carrots since the edible portion grows underground. If your soil is heavy clay, consider raised beds.
Colorado Climate & Growing Season
High altitude means intense sun but cool nights. Low humidity. Hail risk in late spring. Short but intense growing season at elevation.
Growing season length varies across Colorado: Front Range (Denver) (5a, 5b, 6a) has a last frost around May 1 - May 15, while Mountain Regions (3a, 3b, 4a, 4b) sees frost end around Jun 1 - Jun 20. This difference matters for carrots — adjust your planting dates to match your specific region.
Growing Tips
Loose, sandy soil is ideal. Rocky or clay soil causes forked roots. Keep soil consistently moist until seeds germinate.
Companion Planting
Plant carrots alongside these companions for better growth:
Keep carrots away from:
The Bottom Line
Last reviewed: March 29, 2026