Frost dates for Soldotna 5ssw, AK
At Soldotna 5ssw, the median last spring frost (32°F) is Jun 11 and the median first fall frost is Sep 1, for a typical growing season of 75 days. For a 90% chance that the last frost has passed, wait until Jul 7. Nearby ZIP codes are in USDA hardiness zone 4b.
- Jun 11Last spring frost (median)50% chance of 32°F after this date
- Jul 7Safer planting date10% chance of 32°F after this date
- Sep 1First fall frost (median)50% chance of 32°F by this date
- 75 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 |
|---|---|---|---|
| 32°F | May 26 | Jun 11 | Jul 7 |
| 28°F | May 9 | May 23 | Jun 6 |
| 24°F | Apr 21 | May 5 | May 21 |
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 |
|---|---|---|---|
| 32°F | Aug 11 | Sep 1 | Sep 18 |
| 28°F | Aug 28 | Sep 16 | Oct 2 |
| 24°F | Sep 11 | Sep 30 | Oct 18 |
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 | 21 days | 40 days | 66 days |
| 32°F | 48 days | 75 days | 100 days |
| 28°F | 88 days | 113 days | 135 days |
| 24°F | 123 days | 145 days | 168 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 |
|---|---|---|---|
| 99669 | 4b | -25 to -20°F | 9 km |
| 99610 | 4b | -25 to -20°F | 17 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 USC00508615, at 60.4194, -151.1336, elevation 55 m (180 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 227.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sterling 6sw (14 km)
- Kenai Muni Airport (19 km)
- Kenai 9n (30 km)
- Kenai 29 ENE (50 km)
- Cooper Landing 5 W (64 km)
- Big River Lakes (77 km)
- Homer 9 E (79 km)
- Homer 8 NW (80 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.