Last spring frost
Apr 28
Frost Dates for White Mesa, UT
First fall frost
Oct 21
Growing season
174 days
Hardiness zone
7a
In an average year around White Mesa, UT, the last spring frost (32°F) is about Apr 28 and the first fall frost is about Oct 21, giving roughly a 174-day growing season. To be safe most years, wait until Apr 13 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 28 | May 11 | Apr 26 |
| Freeze (32°F) | May 16 | Apr 28 | Apr 13 |
| Hard (28°F) | May 1 | Apr 14 | Mar 24 |
| Severe (24°F) | Apr 16 | Mar 28 | Mar 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 28 | May 21 | May 17 | May 14 | May 11 | May 7 | May 3 | Apr 30 | Apr 26 |
| 32°F | May 16 | May 8 | May 3 | Apr 30 | Apr 28 | Apr 25 | Apr 21 | Apr 18 | Apr 13 |
| 28°F | May 1 | Apr 25 | Apr 21 | Apr 17 | Apr 14 | Apr 11 | Apr 7 | Apr 3 | Mar 24 |
| 24°F | Apr 16 | Apr 11 | Apr 6 | Apr 2 | Mar 28 | Mar 20 | Mar 13 | Mar 7 | Mar 2 |
| 20°F | Mar 30 | Mar 20 | Mar 13 | Mar 7 | Mar 2 | Feb 26 | Feb 22 | Feb 17 | Feb 12 |
| 16°F | Mar 8 | Mar 1 | Feb 25 | Feb 20 | Feb 16 | Feb 12 | Feb 7 | Feb 2 | Jan 22 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 29 | Oct 10 | Oct 24 |
| Freeze (32°F) | Oct 6 | Oct 21 | Nov 6 |
| Hard (28°F) | Oct 16 | Nov 1 | Nov 17 |
| Severe (24°F) | Oct 24 | Nov 12 | Nov 26 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 29 | Oct 2 | Oct 5 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 20 | Oct 24 |
| 32°F | Oct 6 | Oct 10 | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 28 | Nov 1 | Nov 6 |
| 28°F | Oct 16 | Oct 21 | Oct 24 | Oct 28 | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 17 |
| 24°F | Oct 24 | Oct 31 | Nov 5 | Nov 8 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 26 |
| 20°F | Nov 5 | Nov 11 | Nov 15 | Nov 18 | Nov 21 | Nov 24 | Nov 27 | Dec 1 | Dec 7 |
| 16°F | Nov 15 | Nov 21 | Nov 26 | Nov 29 | Dec 3 | Dec 6 | Dec 10 | Dec 14 | Dec 20 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Blanding, Ut, about 7.2 miles away@if(!empty($station['elevation_ft'])), at 6,032 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in White Mesa, UT?
On average, the last spring frost (32°F) around White Mesa, UT is about Apr 28. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 13.
When is the first frost in the fall?
The first fall frost around White Mesa, UT typically arrives about Oct 21. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 28 on average, or Apr 13 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 174 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 84511 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026