Frost dates for Ruby 44 ESE, AK
At Ruby 44 ESE, the median last spring frost (32°F) is May 22 and the median first fall frost is Sep 3, for a typical growing season of 101 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zones 1b to 3a.
- May 22Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Sep 3First fall frost (median)50% chance of 32°F by this date
- 101 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 2 | Jun 17 |
| 32°F | May 12 | May 22 | Jun 3 |
| 28°F | May 3 | May 12 | May 24 |
| 24°F | Apr 24 | May 4 | May 12 |
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 10 | Aug 24 | Sep 6 |
| 32°F | Aug 21 | Sep 3 | Sep 17 |
| 28°F | Aug 31 | Sep 13 | Sep 26 |
| 24°F | Sep 7 | Sep 24 | Oct 6 |
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 | 61 days | 80 days | 97 days |
| 32°F | 84 days | 101 days | 119 days |
| 28°F | 103 days | 123 days | 140 days |
| 24°F | 125 days | 142 days | 159 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 |
|---|---|---|---|
| 99768 | 3a | -40 to -35°F | 88 km |
| 99627 | 2b | -45 to -40°F | 108 km |
| 99757 | 2b | -45 to -40°F | 113 km |
| 99777 | 1b | -55 to -50°F | 124 km |
| 99741 | 1b | -55 to -50°F | 133 km |
| 99756 | 1b | -55 to -50°F | 141 km |
| 99746 | 2a | -50 to -45°F | 168 km |
| 99745 | 1b | -55 to -50°F | 172 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 USW00096406, at 64.5014, -154.1297, elevation 79 m (259 ft).
- Data quality: Estimated from nearby stations (2+ years), 6 years of freeze data.
- Average days per year at or below 32°F: 234.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Minchumina (111 km)
- Tanana Calhoun Mem Airport (121 km)
- Galena (134 km)
- McGrath Airport (186 km)
- Denali 27 N (197 km)
- Manley Hot Springs 15ne (197 km)
- Farewell Lake (219 km)
- Kaltag Airport (222 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.