Frost dates for Monashka Creek Dam, AK
At Monashka Creek Dam, the median last spring frost (32°F) is May 27 and the median first fall frost is Sep 23, for a typical growing season of 117 days. For a 90% chance that the last frost has passed, wait until Jun 10. Nearby ZIP codes are in USDA hardiness zones 6a to 7b.
- May 27Last spring frost (median)50% chance of 32°F after this date
- Jun 10Safer planting date10% chance of 32°F after this date
- Sep 23First fall frost (median)50% chance of 32°F by this date
- 117 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 31 | Jun 13 | Jun 26 |
| 32°F | May 8 | May 27 | Jun 10 |
| 28°F | Apr 11 | May 2 | May 22 |
| 24°F | Mar 25 | Apr 9 | Apr 29 |
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 7 | Sep 22 |
| 32°F | Sep 5 | Sep 23 | Oct 6 |
| 28°F | Sep 19 | Oct 4 | Oct 23 |
| 24°F | Oct 1 | Oct 19 | Nov 10 |
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 | 62 days | 84 days | 105 days |
| 32°F | 96 days | 117 days | 140 days |
| 28°F | 130 days | 157 days | 183 days |
| 24°F | 165 days | 191 days | 218 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 |
|---|---|---|---|
| 99644 | 7b | 5 to 10°F | 9 km |
| 99550 | 7a | 0 to 5°F | 24 km |
| 99615 | 7a | 0 to 5°F | 57 km |
| 99643 | 7b | 5 to 10°F | 87 km |
| 99624 | 7b | 5 to 10°F | 92 km |
| 99608 | 7a | 0 to 5°F | 117 km |
| 99663 | 6b | -5 to 0°F | 180 km |
| 99603 | 6a | -10 to -5°F | 202 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 USC00505884, at 57.8425, -152.4586, elevation 40 m (130 ft).
- Data quality: Estimated from nearby stations (2+ years), 7 years of freeze data.
- Average days per year at or below 32°F: 169.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Kodiak Wastewater Plant (7 km)
- Ouzinkie (10 km)
- Kodiak Airport (10 km)
- Kitoi Bay (39 km)
- Seldovia Airport (183 km)
- Homer Airport (208 km)
- King Salmon 42 SE (208 km)
- Homer 8 NW (217 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.