When to Plant Broccoli in Wyoming
Start Seeds Indoors
Saturday, March 14, 2026
Transplant outdoors: Saturday, April 25, 2026
State
Wyoming
USDA Zones
4a, 4b, 5a, 5b
Avg Last Frost
Saturday, April 25, 2026
Cities Covered
176
Wyoming Planting Schedule by Zone
Wyoming spans 4 zones — find yours below for the most accurate dates.
| Zone | Last Frost | Start Indoors | Transplant |
|---|---|---|---|
| 4a | Friday, May 15, 2026 | Friday, April 3, 2026 | Friday, May 15, 2026 |
| 4b | Tuesday, May 5, 2026 | Tuesday, March 24, 2026 | Tuesday, May 5, 2026 |
| 5a | Sunday, May 10, 2026 | Sunday, March 29, 2026 | Sunday, May 10, 2026 |
| 5b | Saturday, April 25, 2026 | Saturday, March 14, 2026 | Saturday, April 25, 2026 |
Dates based on average last frost. Check your local forecast before planting.
🌿 About Broccoli
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Growing Broccoli in Wyoming: Complete Guide
Broccoli (Brassica oleracea var. italica) is a warm-season crop that needs a head start indoors before Wyoming's last frost. Most Wyoming gardeners begin seeds indoors around Saturday, March 14, 2026 and move transplants outside around Saturday, April 25, 2026, after the risk of frost has passed.
Because Wyoming stretches across 4 USDA hardiness zones (4a, 4b, 5a, 5b), planting windows can shift by as much as two to four weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.
With 60 days to maturity, Broccoli needs the indoor head start that Wyoming's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.
Broccoli requires full sun (6 hours) and regular (1-1.5 inches/week) moisture. Most of Wyoming receives adequate sunlight during the growing season, though gardeners in humid eastern regions should watch for fungal issues and ensure good air circulation.
For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Wyoming.
Growing Broccoli in Wyoming: Local Tips
Climate-specific advice for Wyoming gardeners.
Two short crops at altitude
Colorado gardeners often get a June spring crop and an October fall crop from two plantings; the summer heat in between is too intense for broccoli head formation.
Frequently Asked Questions
When should I plant Broccoli in Wyoming?
In Wyoming, start Broccoli seeds indoors around Saturday, March 14, 2026 and transplant outdoors around Saturday, April 25, 2026 after your last frost. Wyoming spans zones 4a–5b, so dates shift by 1–4 weeks depending on where you live.
What is the last frost date in Wyoming?
Wyoming spans 4 USDA zones (4a, 4b, 5a, 5b), so last frost dates vary by region. Bosler, Laramie, Medicine Bow (4a) sees frost until around Friday, May 15, 2026, while Cheyenne, Fe Warren Afb, Albin (5b) is frost-free much earlier.
How long does Broccoli take to grow in Wyoming?
Broccoli takes about 60 days from transplant (or direct sow) to harvest. Starting seeds indoors in Wyoming gives you a head start so plants are ready to go out after the last frost.
What USDA zones does Wyoming cover for Broccoli?
Wyoming includes zones 4a, 4b, 5a, 5b. Broccoli grows well across all of these zones with adjusted timing — use the zone table above to find the right dates for your part of the state.
Find Precise Dates for Your City
Select a city for exact planting dates based on local frost records.