Frost dates for Campbell Creek Sci Center, AK
At Campbell Creek Sci Center, the median last spring frost (32°F) is May 28 and the median first fall frost is Sep 12, for a typical growing season of 107 days. For a 90% chance that the last frost has passed, wait until Jun 6. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 28Last spring frost (median)50% chance of 32°F after this date
- Jun 6Safer planting date10% chance of 32°F after this date
- Sep 12First fall frost (median)50% chance of 32°F by this date
- 107 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 30 | Jun 8 | Jun 27 |
| 32°F | May 17 | May 28 | Jun 6 |
| 28°F | May 1 | May 15 | May 28 |
| 24°F | Apr 14 | Apr 30 | May 15 |
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 17 | Sep 1 | Sep 14 |
| 32°F | Aug 30 | Sep 12 | Sep 25 |
| 28°F | Sep 9 | Sep 24 | Oct 6 |
| 24°F | Sep 20 | Oct 2 | Oct 18 |
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 | 82 days | 98 days |
| 32°F | 89 days | 107 days | 124 days |
| 28°F | 112 days | 131 days | 150 days |
| 24°F | 135 days | 156 days | 178 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 |
|---|---|---|---|
| 99508 | 5a | -20 to -15°F | 5 km |
| 99518 | 5a | -20 to -15°F | 6 km |
| 99501 | 5a | -20 to -15°F | 8 km |
| 99515 | 5a | -20 to -15°F | 8 km |
| 99513 | 5b | -15 to -10°F | 8 km |
| 99517 | 5b | -15 to -10°F | 9 km |
| 99504 | 5a | -20 to -15°F | 10 km |
| 99516 | 5b | -15 to -10°F | 10 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 USC00501220, at 61.1639, -149.7778, elevation 79 m (258 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 230.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Anchorage Merrill Field (7 km)
- Anchorage Upper De Armoun (8 km)
- Glen Alps (8 km)
- Anchorage Rabbit Creek #2 (8 km)
- Fort Richardson Water Plant (10 km)
- Anchorage Lake Hood Airport (10 km)
- Anchorage Forecast Office (11 km)
- Anchorage Intl Airport (13 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.