When to Plant Basil in Utah
Start Seeds Indoors
Saturday, February 28, 2026
Transplant outdoors: Saturday, May 9, 2026
State
Utah
USDA Zones
4a, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Avg Last Frost
Saturday, April 25, 2026
Cities Covered
250
Utah Planting Schedule by Zone
Utah spans 9 zones — find yours below for the most accurate dates.
| Zone | Last Frost | Start Indoors | Transplant |
|---|---|---|---|
| 4a | Friday, May 15, 2026 | Friday, March 20, 2026 | Friday, May 29, 2026 |
| 5a | Sunday, May 10, 2026 | Sunday, March 15, 2026 | Sunday, May 24, 2026 |
| 5b | Saturday, April 25, 2026 | Saturday, February 28, 2026 | Saturday, May 9, 2026 |
| 6a | Monday, April 20, 2026 | Monday, February 23, 2026 | Monday, May 4, 2026 |
| 6b | Wednesday, April 15, 2026 | Wednesday, February 18, 2026 | Wednesday, April 29, 2026 |
| 7a | Friday, April 10, 2026 | Friday, February 13, 2026 | Friday, April 24, 2026 |
| 7b | Sunday, April 5, 2026 | Sunday, February 8, 2026 | Sunday, April 19, 2026 |
| 8a | Friday, March 20, 2026 | Friday, January 23, 2026 | Friday, April 3, 2026 |
| 8b | Sunday, March 15, 2026 | Sunday, January 18, 2026 | Sunday, March 29, 2026 |
Dates based on average last frost. Check your local forecast before planting.
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Growing Basil in Utah: Complete Guide
Basil (Ocimum basilicum) is a warm-season crop that needs a head start indoors before Utah's last frost. Most Utah gardeners begin seeds indoors around Saturday, February 28, 2026 and move transplants outside around Saturday, May 9, 2026, after the risk of frost has passed.
Because Utah stretches across 9 USDA hardiness zones (4a, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b), planting windows can shift by as much as six to eight 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, Basil needs the indoor head start that Utah's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.
Basil requires full sun (6-8 hours) and regular (keep moist) moisture. Most of Utah 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 Utah.
Growing Basil in Utah: Local Tips
Climate-specific advice for Utah gardeners.
Afternoon shade prevents leaf scorch
In Arizona and New Mexico, full midday and afternoon sun above 100°F causes basil leaves to bleach and develop a harsh, bitter flavor; grow in morning sun only.
Water deeply every other day
Desert heat demands consistent moisture; basil in sandy Southwest soils dries out fast — use drip irrigation or hand-water at the base every 1–2 days.
Frequently Asked Questions
When should I plant Basil in Utah?
In Utah, start Basil seeds indoors around Saturday, February 28, 2026 and transplant outdoors around Saturday, May 9, 2026 after your last frost. Utah spans zones 4a–8b, so dates shift by 1–4 weeks depending on where you live.
What is the last frost date in Utah?
Utah spans 9 USDA zones (4a, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b), so last frost dates vary by region. Randolph (4a) sees frost until around Friday, May 15, 2026, while Hurricane, Ivins, Leeds (8b) is frost-free much earlier.
How long does Basil take to grow in Utah?
Basil takes about 60 days from transplant (or direct sow) to harvest. Starting seeds indoors in Utah gives you a head start so plants are ready to go out after the last frost.
What USDA zones does Utah cover for Basil?
Utah includes zones 4a, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. Basil 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.