Last spring frost
May 25
Frost Dates for Morgan, UT
First fall frost
Sep 24
Growing season
119 days
Hardiness zone
6a
In an average year around Morgan, UT, the last spring frost (32°F) is about May 25 and the first fall frost is about Sep 24, giving roughly a 119-day growing season. To be safe most years, wait until May 7 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 26 | Jun 11 | May 28 |
| Freeze (32°F) | Jun 13 | May 25 | May 7 |
| Hard (28°F) | May 31 | May 8 | Apr 22 |
| Severe (24°F) | May 9 | Apr 21 | Apr 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 26 | Jun 20 | Jun 17 | Jun 13 | Jun 11 | Jun 8 | Jun 5 | Jun 2 | May 28 |
| 32°F | Jun 13 | Jun 7 | Jun 3 | May 30 | May 25 | May 21 | May 16 | May 11 | May 7 |
| 28°F | May 31 | May 22 | May 16 | May 11 | May 8 | May 5 | May 1 | Apr 28 | Apr 22 |
| 24°F | May 9 | May 2 | Apr 29 | Apr 25 | Apr 21 | Apr 18 | Apr 14 | Apr 9 | Apr 4 |
| 20°F | Apr 23 | Apr 17 | Apr 11 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 22 | Mar 16 |
| 16°F | Apr 8 | Apr 3 | Mar 30 | Mar 25 | Mar 20 | Mar 16 | Mar 11 | Mar 7 | Mar 2 |
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 1 | Sep 14 | Sep 28 |
| Freeze (32°F) | Sep 11 | Sep 24 | Oct 6 |
| Hard (28°F) | Sep 21 | Oct 4 | Oct 19 |
| Severe (24°F) | Oct 1 | Oct 17 | Nov 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 1 | Sep 5 | Sep 9 | Sep 12 | Sep 14 | Sep 17 | Sep 20 | Sep 23 | Sep 28 |
| 32°F | Sep 11 | Sep 15 | Sep 18 | Sep 21 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 6 |
| 28°F | Sep 21 | Sep 26 | Sep 28 | Oct 1 | Oct 4 | Oct 6 | Oct 9 | Oct 14 | Oct 19 |
| 24°F | Oct 1 | Oct 5 | Oct 9 | Oct 13 | Oct 17 | Oct 19 | Oct 23 | Oct 26 | Nov 1 |
| 20°F | Oct 13 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 7 | Nov 14 |
| 16°F | Oct 22 | Oct 29 | Nov 1 | Nov 4 | Nov 8 | Nov 10 | Nov 14 | Nov 18 | Nov 24 |
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: Morgan, Ut, about 2.7 miles away@if(!empty($station['elevation_ft'])), at 5,100 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 Morgan, UT?
On average, the last spring frost (32°F) around Morgan, UT is about May 25. In cooler years it can run later, so for a safer bet many gardeners wait until May 7.
When is the first frost in the fall?
The first fall frost around Morgan, UT typically arrives about Sep 24. 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 25 on average, or May 7 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 119 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 84050 Planting calendar → Utah frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026