Last spring frost
Jun 5
Frost Dates for Samak, UT
First fall frost
Sep 17
Growing season
100 days
Hardiness zone
5b
In an average year around Samak, UT, the last spring frost (32°F) is about Jun 5 and the first fall frost is about Sep 17, giving roughly a 100-day growing season. To be safe most years, wait until May 20 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%) |
|---|---|---|---|
| Freeze (32°F) | Jun 23 | Jun 5 | May 20 |
| Hard (28°F) | Jun 6 | May 19 | May 1 |
| Severe (24°F) | May 21 | May 1 | Apr 14 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 23 | Jun 17 | Jun 13 | Jun 9 | Jun 5 | Jun 2 | May 30 | May 25 | May 20 |
| 28°F | Jun 6 | Jun 1 | May 28 | May 23 | May 19 | May 14 | May 10 | May 5 | May 1 |
| 24°F | May 21 | May 14 | May 9 | May 5 | May 1 | Apr 28 | Apr 24 | Apr 19 | Apr 14 |
| 20°F | May 4 | Apr 27 | Apr 21 | Apr 17 | Apr 14 | Apr 9 | Apr 6 | Apr 3 | Mar 29 |
| 16°F | Apr 18 | Apr 12 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 24 | Mar 16 | Mar 11 |
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%) |
|---|---|---|---|
| Freeze (32°F) | Sep 1 | Sep 17 | Oct 1 |
| Hard (28°F) | Sep 11 | Sep 27 | Oct 12 |
| Severe (24°F) | Sep 25 | Oct 9 | Oct 25 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Sep 1 | Sep 7 | Sep 11 | Sep 14 | Sep 17 | Sep 20 | Sep 23 | Sep 27 | Oct 1 |
| 28°F | Sep 11 | Sep 17 | Sep 21 | Sep 25 | Sep 27 | Sep 30 | Oct 3 | Oct 6 | Oct 12 |
| 24°F | Sep 25 | Sep 30 | Oct 3 | Oct 6 | Oct 9 | Oct 13 | Oct 16 | Oct 21 | Oct 25 |
| 20°F | Oct 6 | Oct 12 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Nov 1 | Nov 6 |
| 16°F | Oct 17 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 8 | Nov 12 | Nov 17 |
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: Kamas, Ut, about 14.2 miles away@if(!empty($station['elevation_ft'])), at 6,481 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 Samak, UT?
On average, the last spring frost (32°F) around Samak, UT is about Jun 5. In cooler years it can run later, so for a safer bet many gardeners wait until May 20.
When is the first frost in the fall?
The first fall frost around Samak, UT typically arrives about Sep 17. 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 Jun 5 on average, or May 20 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 100 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 84036 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026