Last spring frost
May 12
Frost Dates for Snowville, UT
First fall frost
Oct 5
Growing season
144 days
Hardiness zone
6a
In an average year around Snowville, UT, the last spring frost (32°F) is about May 12 and the first fall frost is about Oct 5, giving roughly a 144-day growing season. To be safe most years, wait until Apr 27 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) | Jun 19 | Jun 1 | May 11 |
| Freeze (32°F) | Jun 8 | May 12 | Apr 27 |
| Hard (28°F) | May 13 | Apr 27 | Apr 12 |
| Severe (24°F) | Apr 30 | Apr 11 | Mar 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 19 | Jun 13 | Jun 9 | Jun 5 | Jun 1 | May 27 | May 21 | May 16 | May 11 |
| 32°F | Jun 8 | May 31 | May 22 | May 17 | May 12 | May 8 | May 5 | May 1 | Apr 27 |
| 28°F | May 13 | May 6 | May 3 | Apr 30 | Apr 27 | Apr 24 | Apr 20 | Apr 18 | Apr 12 |
| 24°F | Apr 30 | Apr 24 | Apr 19 | Apr 16 | Apr 11 | Apr 7 | Apr 3 | Mar 29 | Mar 19 |
| 20°F | Apr 14 | Apr 8 | Apr 2 | Mar 29 | Mar 22 | Mar 17 | Mar 13 | Mar 10 | Mar 5 |
| 16°F | Mar 30 | Mar 20 | Mar 14 | Mar 10 | Mar 7 | Mar 5 | Mar 2 | Feb 28 | Feb 21 |
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 10 | Sep 25 | Oct 7 |
| Freeze (32°F) | Sep 24 | Oct 5 | Oct 18 |
| Hard (28°F) | Oct 2 | Oct 15 | Oct 27 |
| Severe (24°F) | Oct 11 | Oct 24 | Nov 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 10 | Sep 17 | Sep 21 | Sep 23 | Sep 25 | Sep 27 | Sep 30 | Oct 3 | Oct 7 |
| 32°F | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 11 | Oct 14 | Oct 18 |
| 28°F | Oct 2 | Oct 6 | Oct 10 | Oct 12 | Oct 15 | Oct 17 | Oct 20 | Oct 23 | Oct 27 |
| 24°F | Oct 11 | Oct 15 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Oct 30 | Nov 2 | Nov 7 |
| 20°F | Oct 19 | Oct 25 | Oct 28 | Oct 31 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 18 |
| 16°F | Oct 28 | Nov 2 | Nov 6 | Nov 10 | Nov 13 | Nov 17 | Nov 20 | Nov 24 | Nov 28 |
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: Brigham City 28 Wnw, Ut, about 24.3 miles away@if(!empty($station['elevation_ft'])), at 4,951 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 Snowville, UT?
On average, the last spring frost (32°F) around Snowville, UT is about May 12. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 27.
When is the first frost in the fall?
The first fall frost around Snowville, UT typically arrives about Oct 5. 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 May 12 on average, or Apr 27 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 144 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 84336 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026