Planting Dates for Wyoming
Wyoming's high altitude, strong winds, and short seasons make it one of the more challenging states for vegetable gardening. Sheltered valleys and lower elevations offer the best opportunities.
USDA Zones 3a-5b • 80-130 frost-free days depending on location
Frost Dates in Wyoming
Average last spring frost and first fall frost dates for Wyoming cities. Use these to calculate your planting windows.
| City | Last Spring Frost | First Fall Frost | Frost-Free Days | USDA Zone |
|---|---|---|---|---|
| Cheyenne | May 18 | Sep 21 | 126 | 5b |
| Casper | May 20 | Sep 20 | 123 | 5a |
| Sheridan | May 20 | Sep 18 | 121 | 4b |
Gardening Tips for Wyoming
- ✓Wind protection is the number one priority for Wyoming vegetable gardens.
- ✓Lower elevations along river valleys have the longest growing seasons.
- ✓Plan for last frost around May 20-June 5 in most populated areas.
- ✓Choose cold-hardy, short-season varieties that mature in 55-70 days.
What to Plant in Wyoming
Cold-Hardy Crops (plant early)
These crops tolerate frost and can be planted 2-6 weeks before your last frost date.
30-60 days from sowing
55-70 days from sowing
60-80 days from sowing
50-70 days from sowing
55-80 days from transplant
35-50 days from sowing
20-35 days from sowing
July-August the following year
90-120 days from transplant
70-120 days from planting
50-70 days from sowing
50-60 days from sowing
Warm-Season Crops (plant after last frost)
Start these indoors and transplant after all frost danger has passed.
60-85 days from transplant
60-90 days from transplant
50-65 days from sowing
50-65 days from sowing
45-60 days from sowing
60-100 days from sowing
30-60 days from sowing
Get Exact Planting Dates for Wyoming
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Frequently Asked Questions
When is the last frost date in Wyoming?
Last frost dates in Wyoming vary by city: Cheyenne (May 18), Casper (May 20), Sheridan (May 20).
What USDA hardiness zones are in Wyoming?
Wyoming spans USDA hardiness zones 3a-5b. Your specific zone determines which perennials survive winter and when to start planting annuals.
What vegetables grow best in Wyoming?
Hardy crops like peas, kale, spinach, and garlic thrive across Wyoming. In warmer zones, tomatoes, peppers, and cucumbers do well with proper timing. Use our free calculator for exact planting dates.
How long is the growing season in Wyoming?
80-130 frost-free days depending on location. Extend your season with cold frames, row covers, and indoor seed starting.
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Calculate exact planting dates based on your location and frost dates.