Utah Planting Guide & Growing Season
Utah is in USDA hardiness zone 4a-8a with a growing season of 155 days. The average last spring frost is May 5 and the average first fall frost is Oct 5.
Growing Conditions in Utah
How Utah Compares
Compare Utah's growing conditions with states that have similar climates.
| State | USDA Zone | Last Frost | First Frost | Season (days) |
|---|---|---|---|---|
| Utah (UT) | 4a-8a | May 5 | Oct 5 | 155 |
| Alabama (AL) | 7a-8b | Mar 15 | Nov 5 | 235 |
| Alaska (AK) | 1a-7b | May 30 | Sep 5 | 100 |
| Arizona (AZ) | 4b-10b | Mar 1 | Nov 15 | 260 |
| Arkansas (AR) | 6b-8a | Apr 1 | Oct 25 | 210 |
| California (CA) | 4b-11a | Feb 15 | Nov 30 | 290 |
Frequently Asked Questions About Gardening in Utah
When should I start seeds indoors in Utah?
In Utah, the average last frost date is May 5. Start most seeds indoors 6-8 weeks before this date. The USDA hardiness zone for Utah is 4a-8a, with a growing season of approximately 155 days.
What USDA hardiness zone is Utah?
Utah falls in USDA hardiness zones 4a-8a. This affects which perennial plants will survive winter and influences optimal planting times.
When is the first frost in Utah?
The average first frost date in Utah is Oct 5. Plan to harvest cold-sensitive crops before this date or protect them with row covers.
How long is the growing season in Utah?
Utah has an average growing season of 155 days, from the last frost (May 5) to first frost (Oct 5). This moderate season works well for most common vegetables.
Plan Your Garden
Use our seed starting calculator to get personalized planting dates, or browse all states.