Frost dates for Cle Elum, WA
At Cle Elum, the median last spring frost (32°F) is May 13 and the median first fall frost is Sep 25, for a typical growing season of 132 days. For a 90% chance that the last frost has passed, wait until Jun 1. Nearby ZIP codes are in USDA hardiness zone 7a.
- May 13Last spring frost (median)50% chance of 32°F after this date
- Jun 1Safer planting date10% chance of 32°F after this date
- Sep 25First fall frost (median)50% chance of 32°F by this date
- 132 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 13 | Jun 1 | Jun 19 |
| 32°F | Apr 29 | May 13 | Jun 1 |
| 28°F | Apr 12 | Apr 28 | May 14 |
| 24°F | Mar 14 | Apr 4 | Apr 27 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Aug 31 | Sep 11 | Sep 27 |
| 32°F | Sep 11 | Sep 25 | Oct 7 |
| 28°F | Sep 20 | Oct 5 | Oct 23 |
| 24°F | Oct 2 | Oct 20 | Nov 7 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 78 days | 102 days | 126 days |
| 32°F | 110 days | 132 days | 152 days |
| 28°F | 137 days | 159 days | 187 days |
| 24°F | 168 days | 198 days | 228 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98943 | 7a | 0 to 5°F | 4 km |
| 98922 | 7a | 0 to 5°F | 5 km |
| 98941 | 7a | 0 to 5°F | 8 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00451504, at 47.1889, -120.9131, elevation 579 m (1,900 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 156.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Easton (22 km)
- Stampede Pass (33 km)
- Ellensburg Bowers Field (34 km)
- Ellensburg (37 km)
- Leavenworth 3 S (45 km)
- Wenatchee (53 km)
- Wenatchee Pangborn Airport (58 km)
- Selah 2 NE (65 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.