Frost dates for McCall Airport, ID
At McCall Airport, the median last spring frost (32°F) is Jun 10 and the median first fall frost is Sep 10, for a typical growing season of 93 days. For a 90% chance that the last frost has passed, wait until Jun 28. Nearby ZIP codes are in USDA hardiness zones 5a to 6b.
- Jun 10Last spring frost (median)50% chance of 32°F after this date
- Jun 28Safer planting date10% chance of 32°F after this date
- Sep 10First fall frost (median)50% chance of 32°F by this date
- 93 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 21 | Jun 10 | Jun 28 |
| 28°F | Apr 30 | May 15 | Jun 6 |
| 24°F | Apr 12 | Apr 28 | May 13 |
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 29 | Sep 10 | Sep 25 |
| 28°F | Sep 10 | Sep 25 | Oct 9 |
| 24°F | Sep 24 | Oct 8 | Oct 24 |
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 | 40 days | 63 days | 83 days |
| 32°F | 70 days | 93 days | 116 days |
| 28°F | 104 days | 130 days | 152 days |
| 24°F | 141 days | 163 days | 185 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 |
|---|---|---|---|
| 83615 | 5a | -20 to -15°F | 21 km |
| 83612 | 6a | -10 to -5°F | 34 km |
| 83654 | 6a | -10 to -5°F | 40 km |
| 83638 | 5a | -20 to -15°F | 40 km |
| 83643 | 6a | -10 to -5°F | 40 km |
| 83632 | 6a | -10 to -5°F | 47 km |
| 83547 | 6b | -5 to 0°F | 50 km |
| 83549 | 6b | -5 to 0°F | 54 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 USW00094182, at 44.8889, -116.1017, elevation 1528 m (5,013 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 224.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- McCall (0 km)
- New Meadows Ranger Station (18 km)
- Council (31 km)
- Cascade 1 NW (41 km)
- Yellowpine (48 km)
- Warren (53 km)
- Riggins (57 km)
- Cambridge (57 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.