Last spring frost
Apr 1
Frost Dates for Apple Valley, UT
First fall frost
Nov 5
Growing season
217 days
Hardiness zone
8b
In an average year around Apple Valley, UT, the last spring frost (32°F) is about Apr 1 and the first fall frost is about Nov 5, giving roughly a 217-day growing season. To be safe most years, wait until Mar 5 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 9 | Apr 20 | Mar 30 |
| Freeze (32°F) | Apr 24 | Apr 1 | Mar 5 |
| Hard (28°F) | Apr 2 | Mar 4 | Feb 12 |
| Severe (24°F) | Mar 5 | Feb 13 | Jan 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 9 | May 3 | Apr 29 | Apr 24 | Apr 20 | Apr 15 | Apr 11 | Apr 6 | Mar 30 |
| 32°F | Apr 24 | Apr 16 | Apr 10 | Apr 5 | Apr 1 | Mar 27 | Mar 19 | Mar 13 | Mar 5 |
| 28°F | Apr 2 | Mar 24 | Mar 13 | Mar 8 | Mar 4 | Feb 28 | Feb 25 | Feb 19 | Feb 12 |
| 24°F | Mar 5 | Feb 26 | Feb 21 | Feb 17 | Feb 13 | Feb 9 | Feb 5 | Jan 31 | Jan 23 |
| 20°F | Feb 16 | Feb 8 | Feb 3 | Jan 31 | Jan 25 | Jan 20 | Jan 11 | Jan 2 | Dec 23 |
| 16°F | Feb 3 | Jan 24 | Jan 17 | Jan 9 | Jan 3 | Dec 29 | Dec 24 | Dec 17 | Dec 9 |
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) | Oct 15 | Oct 27 | Nov 8 |
| Freeze (32°F) | Oct 23 | Nov 5 | Nov 17 |
| Hard (28°F) | Nov 1 | Nov 15 | Nov 28 |
| Severe (24°F) | Nov 11 | Nov 26 | Dec 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 8 |
| 32°F | Oct 23 | Oct 28 | Oct 31 | Nov 3 | Nov 5 | Nov 7 | Nov 10 | Nov 13 | Nov 17 |
| 28°F | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 20 | Nov 24 | Nov 28 |
| 24°F | Nov 11 | Nov 16 | Nov 20 | Nov 23 | Nov 26 | Nov 29 | Dec 2 | Dec 6 | Dec 13 |
| 20°F | Nov 21 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 12 | Dec 17 | Dec 22 | Dec 31 |
| 16°F | Dec 1 | Dec 6 | Dec 11 | Dec 16 | Dec 21 | Dec 25 | Dec 31 | Jan 5 | Jan 19 |
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: La Verkin, Ut, about 11.9 miles away@if(!empty($station['elevation_ft'])), at 3,194 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 Apple Valley, UT?
On average, the last spring frost (32°F) around Apple Valley, UT is about Apr 1. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 5.
When is the first frost in the fall?
The first fall frost around Apple Valley, UT typically arrives about Nov 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 Apr 1 on average, or Mar 5 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 217 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 84737 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026