Frost dates for Haines 40nw, AK
At Haines 40nw, the median last spring frost (32°F) is May 24 and the median first fall frost is Sep 20, for a typical growing season of 118 days. For a 90% chance that the last frost has passed, wait until Jun 10. Nearby ZIP codes are in USDA hardiness zones 5a to 7a.
- May 24Last spring frost (median)50% chance of 32°F after this date
- Jun 10Safer planting date10% chance of 32°F after this date
- Sep 20First fall frost (median)50% chance of 32°F by this date
- 118 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 28 | Jun 9 | Jun 27 |
| 32°F | May 10 | May 24 | Jun 10 |
| 28°F | Apr 20 | May 4 | May 19 |
| 24°F | Apr 7 | Apr 19 | May 4 |
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 6 | Sep 20 |
| 32°F | Sep 1 | Sep 20 | Oct 5 |
| 28°F | Sep 17 | Oct 4 | Oct 22 |
| 24°F | Oct 2 | Oct 21 | Nov 4 |
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 | 59 days | 87 days | 108 days |
| 32°F | 91 days | 118 days | 138 days |
| 28°F | 127 days | 152 days | 173 days |
| 24°F | 158 days | 182 days | 203 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 |
|---|---|---|---|
| 99840 | 5a | -20 to -15°F | 59 km |
| 99827 | 5b | -15 to -10°F | 71 km |
| 99850 | 7a | 0 to 5°F | 118 km |
| 99826 | 7a | 0 to 5°F | 120 km |
| 99825 | 7a | 0 to 5°F | 152 km |
| 99832 | 7a | 0 to 5°F | 166 km |
| 99829 | 7a | 0 to 5°F | 170 km |
| 99689 | 6b | -5 to 0°F | 173 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 USC00503504, at 59.4503, -136.3614, elevation 250 m (820 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 207.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Haines Airport (54 km)
- Haines #2 (57 km)
- Skagway Airport (59 km)
- Skagway (59 km)
- Glacier Bay (114 km)
- Gustavus 2 NE (120 km)
- Gustavus (121 km)
- Elfin Cove (140 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.