When to Plant Turnip in Colorado (2026 Guide)
When planning your turnip planting in Colorado for 2026, it's crucial to consider the state's diverse climatic conditions across its various hardiness zones. For instance, Zone 5b has a median last spring frost date of May 5, while in Zone 6a, this date arrives earlier on April 25. Understanding these frost dates helps ensure optimal growth for your turnips.
Turnips thrive in cooler temperatures, making them well-suited for Colorado's variable climate. With a growing season of approximately 149 days in Zone 5b and 174 days in Zone 6a, gardeners can enjoy multiple planting opportunities throughout the year. They are uniquely suited to the late summer and early fall conditions, which can enhance their flavor significantly.
For successful turnip cultivation, direct sowing is the recommended method, particularly for the taproot structure they develop. Remember to give them enough space by thinning seedlings decisively, which is vital for proper root development. In this guide, we will explore planting windows, common mistakes, and much more to help you maximize your turnip harvest.
Planting Schedule by USDA Zone in Colorado
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Not recommended — direct sow only. | Not recommended — direct sow only. | Direct sow from April 15 – May 10, after the last frost. | Harvest from September 15 – October 15, before the first frost. |
| Zone 5a | Not recommended — direct sow only. | Not recommended — direct sow only. | Direct sow from April 25 – May 17, after the last frost. | Harvest from September 1 – September 30, before the first frost. |
| Zone 6a | Not recommended — direct sow only. | Not recommended — direct sow only. | Direct sow from April 1 – April 25, after the last frost. | Harvest from October 1 – October 16, before the first frost. |
Turnip Planting Windows in Colorado
- Indoor start: Indoor starting is not recommended, as turnips should only be direct sown from early April to mid-May.
- Transplant outdoors: Outdoor transplanting is also not recommended; direct sowing should be done from April 1 to May 17, depending on your zone.
- Harvest: Turnips can be harvested from September 1 to October 16, just before the first frost sets in.
Common Mistakes Growing Turnip in Colorado
- One common mistake in Colorado is planting turnips too close together, which can lead to elongated roots. Always thin seedlings to 4-6 inches apart to ensure good root development and maximize flavor.
- Many gardeners in Colorado also fail to consider late frosts that can occur in May. Be sure to monitor local weather conditions and plant turnips at the appropriate time based on frost dates in your area.
- Overlooking the unique growing conditions of Colorado, such as its high altitude and dry climate, can result in poor turnip yields. Consider soil amendments to improve moisture retention and nutrient availability for better results.
- A frequent misconception is that you can start turnips indoors in Colorado, which is not recommended because they are taproot crops. Turnips should always be direct sown for optimal growth.
- Some gardeners mistakenly believe that turnips only thrive in spring. However, planting in late summer takes advantage of cooler fall temperatures, improving flavor and aiding in frost hardiness.
Frequently Asked Questions
What if I'm in a cold pocket of Colorado?
Cold pockets can delay your planting schedule. Ensure you monitor local frost dates closely and consider adjusting your sowing date to account for late chilling winds or frosts.
Can I still plant turnip in May?
Yes, turnips can be sown until May 17 in most of Zone 5a. Keep an eye on the weather, though, as unexpected late frosts can hinder growth.
How do I know if my turnips are ready to harvest?
Turnips should be harvested when they reach about 2-3 inches in diameter for the best flavor. Check soil conditions regularly to gauge root size.
What type of soil is best for growing turnips?
Turnips prefer well-drained, loamy soil with ample organic matter. Since Colorado has alkaline soil, consider adding compost to improve fertility and pH.
Can turnips be grown in containers?
Yes, turnips can be grown in containers as long as they have sufficient depth and room for root growth. Ensure proper drainage and provide enough nutrition to maintain healthy growth.
Keep Learning
City guides in Colorado
Other crops in Colorado
Typical fall sowing window for Turnip in Colorado: July 26 – August 16.