Last spring frost
Apr 22
Frost Dates for West Haven, UT
First fall frost
Oct 18
Growing season
177 days
Hardiness zone
7a
In an average year around West Haven, UT, the last spring frost (32°F) is about Apr 22 and the first fall frost is about Oct 18, giving roughly a 177-day growing season. To be safe most years, wait until Apr 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 26 | May 7 | Apr 22 |
| Freeze (32°F) | May 9 | Apr 22 | Apr 5 |
| Hard (28°F) | Apr 22 | Apr 3 | Mar 12 |
| Severe (24°F) | Apr 4 | Mar 13 | Feb 27 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 26 | May 18 | May 15 | May 10 | May 7 | May 3 | May 1 | Apr 28 | Apr 22 |
| 32°F | May 9 | May 3 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 14 | Apr 10 | Apr 5 |
| 28°F | Apr 22 | Apr 15 | Apr 10 | Apr 6 | Apr 3 | Mar 31 | Mar 26 | Mar 18 | Mar 12 |
| 24°F | Apr 4 | Mar 30 | Mar 23 | Mar 17 | Mar 13 | Mar 10 | Mar 7 | Mar 3 | Feb 27 |
| 20°F | Mar 16 | Mar 11 | Mar 7 | Mar 4 | Mar 1 | Feb 27 | Feb 22 | Feb 16 | Feb 9 |
| 16°F | Mar 7 | Mar 2 | Feb 27 | Feb 22 | Feb 18 | Feb 14 | Feb 9 | Feb 3 | Jan 24 |
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 23 | Oct 6 | Oct 21 |
| Freeze (32°F) | Oct 1 | Oct 18 | Nov 2 |
| Hard (28°F) | Oct 15 | Oct 29 | Nov 13 |
| Severe (24°F) | Oct 23 | Nov 9 | Nov 24 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 23 | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 9 | Oct 13 | Oct 17 | Oct 21 |
| 32°F | Oct 1 | Oct 7 | Oct 11 | Oct 16 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Nov 2 |
| 28°F | Oct 15 | Oct 20 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 7 | Nov 13 |
| 24°F | Oct 23 | Oct 29 | Nov 2 | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 24 |
| 20°F | Nov 2 | Nov 7 | Nov 11 | Nov 16 | Nov 20 | Nov 23 | Nov 26 | Nov 29 | Dec 4 |
| 16°F | Nov 11 | Nov 17 | Nov 21 | Nov 25 | Nov 28 | Dec 1 | Dec 6 | Dec 12 | Dec 18 |
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: Ogden Sugar Factory, Ut, about 0.9 miles away@if(!empty($station['elevation_ft'])), at 4,280 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 West Haven, UT?
On average, the last spring frost (32°F) around West Haven, UT is about Apr 22. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 5.
When is the first frost in the fall?
The first fall frost around West Haven, UT typically arrives about Oct 18. 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 22 on average, or Apr 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 177 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 84401 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026