Frost dates / By state
Frost dates in Utah
NOAA 1991–2020 normals for a 32 °F freeze. Your own yard can run a little either side.
Short answer
Across 16 NOAA weather stations in Utah, the average last spring frost runs from April 8 at Salt Lake City Intl Airport to June 7 at Coalville. The first fall frost comes as early as September 12 at Coalville and as late as October 31 at Salt Lake City Intl Airport. At 1 of the 17 stations, a freeze can come in any month. Planting zones near these stations run from 5b to 7b.
Utah cities
- Frost dates in Salt Lake City: last frost April 8, first frost October 31
Find yours by ZIP code
The table below is by weather station. For the station nearest you, and your planting zone, type your ZIP code.
Utah frost dates by weather station
| Station | Last spring frost | First fall frost | Frost-free | Zone nearby |
|---|---|---|---|---|
| Brigham City 28 WNW 4,951 ft | May 12 1 in 10 after June 8 | October 5 1 in 10 by September 24 | 146 days | 6b |
| Bryce Canyon Airport 7,586 ft | A freeze is possible in any month | 6a | ||
| Cedar City Muni Airport 5,586 ft | May 21 1 in 10 after June 8 | September 29 1 in 10 by September 17 | 131 days | 6b |
| Coalville 5,550 ft | June 7 1 in 10 after June 25 | September 12 1 in 10 by August 28 | 97 days | 6a |
| Delta 4,620 ft | May 16 1 in 10 after June 5 | September 29 1 in 10 by September 16 | 136 days | 6a |
| Granite Peak Dugway Pg 4,300 ft | April 18 1 in 10 after May 5 | October 16 1 in 10 by October 2 | 181 days | – |
| Hanksville 4,308 ft | May 5 1 in 10 after May 23 | October 3 1 in 10 by September 21 | 151 days | 7a |
| Logan Cache Airport 4,454 ft | May 8 1 in 10 after May 29 | October 2 1 in 10 by September 19 | 147 days | 6a |
| Milford Muni Airport 5,040 ft | May 13 1 in 10 after June 2 | October 4 1 in 10 by September 22 | 144 days | 6a |
| Moab Canyonland Airport 4,561 ft | April 22 1 in 10 after May 8 | October 20 1 in 10 by October 6 | 181 days | – |
| Modena 5,460 ft | May 20 1 in 10 after June 6 | October 3 1 in 10 by September 22 | 136 days | 5b |
| Ogden Hinkley Airport 4,470 ft | April 22 1 in 10 after May 10 | October 22 1 in 10 by October 7 | 183 days | 7a |
| Price Carbon Co Airport 5,921 ft | May 3 1 in 10 after May 21 | October 12 1 in 10 by September 29 | 162 days | 6a |
| Salt Lake City Intl Airport 4,225 ft | April 8 1 in 10 after April 30 | October 31 1 in 10 by October 17 | 206 days | 7b |
| Torrey 7 E 6,204 ft | April 22 1 in 10 after May 9 | October 23 1 in 10 by October 9 | 184 days | – |
| Vernal Municipal Airport 5,260 ft | May 6 1 in 10 after May 25 | October 7 1 in 10 by September 25 | 154 days | 5b |
| Wendover Airport AWOS 4,237 ft | April 18 1 in 10 after May 5 | October 23 1 in 10 by October 13 | 188 days | – |
The average date is NOAA's 50% date: half of years have a later last frost, or an earlier first one. Plan by the 1-in-10 date if a freeze would cost you plants. Stations are NOAA's main weather stations, mostly airports. “Zone nearby” is the USDA 2023 zone of the nearest ZIP code within 10 miles. NOAA counts the frost season from August to July, so in the warmest places the “first fall” freeze lands after New Year.
How these dates work
Frost dates come from NOAA's 1991 to 2020 Climate Normals, which work out from each weather station's daily lows how likely the last spring freeze and the first fall freeze (32 °F) are by each date. We use the station nearest the middle of your ZIP code and show its height and distance, since a station on a hill or by a lake can differ from your yard.
The average date is the 50% date: half of years have a freeze after the spring date or before the fall one. The 1-in-10 dates are NOAA's 10% dates, the ones to plan by if a late freeze would cost you plants. Within one yard, cold air pools in low spots while walls and paving hold heat, so some corners freeze before others.
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Where the numbers come from
- USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture
- PRISM Climate Group, Oregon State University (zone data)
- NOAA NCEI, U.S. Climate Normals 1991–2020, annual/seasonal
- NOAA, Normals calculation methodology (frost-freeze probability dates)
- US Census Bureau, 2025 ZCTA gazetteer (ZIP code centers)