Frost dates for Little Su At Hatcher Pass Brg, AK
At Little Su At Hatcher Pass Brg, the median last spring frost (32°F) is May 18 and the median first fall frost is Sep 18, for a typical growing season of 122 days. For a 90% chance that the last frost has passed, wait until May 30. Nearby ZIP codes are in USDA hardiness zones 3b to 5a.
- May 18Last spring frost (median)50% chance of 32°F after this date
- May 30Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 122 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 23 | Jun 3 | Jun 16 |
| 32°F | May 6 | May 18 | May 30 |
| 28°F | Apr 21 | May 3 | May 16 |
| 24°F | Apr 8 | Apr 20 | May 3 |
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 20 | Sep 4 | Sep 19 |
| 32°F | Sep 2 | Sep 18 | Oct 1 |
| 28°F | Sep 15 | Sep 30 | Oct 14 |
| 24°F | Sep 27 | Oct 10 | Oct 25 |
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 | 72 days | 92 days | 108 days |
| 32°F | 103 days | 122 days | 141 days |
| 28°F | 129 days | 150 days | 168 days |
| 24°F | 154 days | 174 days | 192 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 99654 | 5a | -20 to -15°F | 15 km |
| 99645 | 5a | -20 to -15°F | 16 km |
| 99688 | 3b | -35 to -30°F | 28 km |
| 99694 | 4a | -30 to -25°F | 33 km |
| 99652 | 4a | -30 to -25°F | 45 km |
| 99567 | 5a | -20 to -15°F | 47 km |
| 99623 | 4b | -25 to -20°F | 47 km |
| 99505 | 5a | -20 to -15°F | 52 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 USC00505527, at 61.7103, -149.2317, elevation 275 m (902 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 208.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Anderson Lake (11 km)
- Lazy Mountain (14 km)
- Palmer Muni Airport (15 km)
- Palmer Job Corps (15 km)
- Matanuska Exp. Farm (16 km)
- Ben's Farm (17 km)
- Sutton 1 W (17 km)
- Eklutna Water Plant (29 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.