Frost dates for Delta 5 NE, AK
At Delta 5 NE, the median last spring frost (32°F) is Jun 4 and the median first fall frost is Aug 22, for a typical growing season of 75 days. For a 90% chance that the last frost has passed, wait until Jul 17. Nearby ZIP codes are in USDA hardiness zones 2a to 3b.
- Jun 4Last spring frost (median)50% chance of 32°F after this date
- Jul 17Safer planting date10% chance of 32°F after this date
- Aug 22First 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 25 | Jun 4 | Jul 17 |
| 28°F | May 12 | May 24 | Jun 5 |
| 24°F | May 1 | May 13 | May 28 |
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 7 | Aug 22 | Sep 4 |
| 28°F | Aug 15 | Sep 1 | Sep 16 |
| 24°F | Aug 28 | Sep 12 | Sep 27 |
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 | 26 days | 46 days | 73 days |
| 32°F | 48 days | 75 days | 95 days |
| 28°F | 78 days | 99 days | 118 days |
| 24°F | 100 days | 123 days | 144 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 |
|---|---|---|---|
| 99706 | 3b | -35 to -30°F | 46 km |
| 99714 | 3b | -35 to -30°F | 55 km |
| 99737 | 3a | -40 to -35°F | 73 km |
| 99702 | 2a | -50 to -45°F | 93 km |
| 99712 | 3b | -35 to -30°F | 109 km |
| 99705 | 2a | -50 to -45°F | 110 km |
| 99707 | 3b | -35 to -30°F | 123 km |
| 99703 | 2a | -50 to -45°F | 127 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 USC00502350, at 64.0839, -145.6136, elevation 323 m (1,060 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 250.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Delta 6 N (8 km)
- Big Delta Airport (11 km)
- Whitestone Farms (15 km)
- Delta Junction 20 SE (28 km)
- Dry Creek (67 km)
- Eielson Field (96 km)
- Two Rivers (108 km)
- N Pole (111 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.