When to Plant Tomato in Utah
Start Seeds Indoors
Saturday, March 14, 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, April 3, 2026 | Friday, May 29, 2026 |
| 5a | Sunday, May 10, 2026 | Sunday, March 29, 2026 | Sunday, May 24, 2026 |
| 5b | Saturday, April 25, 2026 | Saturday, March 14, 2026 | Saturday, May 9, 2026 |
| 6a | Monday, April 20, 2026 | Monday, March 9, 2026 | Monday, May 4, 2026 |
| 6b | Wednesday, April 15, 2026 | Wednesday, March 4, 2026 | Wednesday, April 29, 2026 |
| 7a | Friday, April 10, 2026 | Friday, February 27, 2026 | Friday, April 24, 2026 |
| 7b | Sunday, April 5, 2026 | Sunday, February 22, 2026 | Sunday, April 19, 2026 |
| 8a | Friday, March 20, 2026 | Friday, February 6, 2026 | Friday, April 3, 2026 |
| 8b | Sunday, March 15, 2026 | Sunday, February 1, 2026 | Sunday, March 29, 2026 |
Dates based on average last frost. Check your local forecast before planting.
🌿 About Tomato
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Growing Tomato in Utah: Complete Guide
Tomato (Solanum lycopersicum) is a warm-season crop that needs a head start indoors before Utah's last frost. Most Utah gardeners begin seeds indoors around Saturday, March 14, 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 70 days to maturity, Tomato 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.
Tomato requires full sun (6-8 hours) and regular (1-2 inches/week) 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 Tomato in Utah: Local Tips
Climate-specific advice for Utah gardeners.
Afternoon shade is a survival tool
In Phoenix or Las Vegas, 110°F afternoons cook fruit on the vine; plant on the east side of a fence or shade cloth to block afternoon sun from 2–6 pm.
Blossom drop above 95°F is inevitable
Don't panic if plants stop setting fruit in July — they're not dead, just waiting. Water consistently, and they'll rebound when temps drop in late August.
Desert soils need organic matter
Alkaline desert soils cause iron and manganese deficiency (yellow leaves with green veins); amend heavily with compost and lower pH to 6.2–6.8 for best results.
Frequently Asked Questions
When should I plant Tomato in Utah?
In Utah, start Tomato seeds indoors around Saturday, March 14, 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 Tomato take to grow in Utah?
Tomato takes about 70 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 Tomato?
Utah includes zones 4a, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. Tomato 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.