Frost dates for Murphy 10 W, ID
At Murphy 10 W, the median last spring frost (32°F) is May 17 and the median first fall frost is Sep 30, for a typical growing season of 134 days. For a 90% chance that the last frost has passed, wait until Jun 6. Nearby ZIP codes are in USDA hardiness zone 7a.
- May 17Last spring frost (median)50% chance of 32°F after this date
- Jun 6Safer planting date10% chance of 32°F after this date
- Sep 30First fall frost (median)50% chance of 32°F by this date
- 134 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 19 | Jun 6 | Jun 19 |
| 32°F | May 2 | May 17 | Jun 6 |
| 28°F | Apr 16 | Apr 30 | May 15 |
| 24°F | Mar 23 | Apr 13 | May 1 |
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 | Sep 4 | Sep 17 | Oct 1 |
| 32°F | Sep 14 | Sep 30 | Oct 14 |
| 28°F | Sep 27 | Oct 11 | Oct 27 |
| 24°F | Oct 9 | Oct 24 | Nov 8 |
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 | 84 days | 103 days | 125 days |
| 32°F | 111 days | 134 days | 157 days |
| 28°F | 143 days | 165 days | 184 days |
| 24°F | 167 days | 191 days | 216 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 |
|---|---|---|---|
| 83641 | 7a | 0 to 5°F | 19 km |
| 83639 | 7a | 0 to 5°F | 25 km |
| 83686 | 7a | 0 to 5°F | 35 km |
| 83650 | 7a | 0 to 5°F | 35 km |
| 83634 | 7a | 0 to 5°F | 44 km |
| 83651 | 7a | 0 to 5°F | 44 km |
| 83628 | 7a | 0 to 5°F | 45 km |
| 83687 | 7a | 0 to 5°F | 49 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 USW00004127, at 43.2044, -116.7506, elevation 1204 m (3,950 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 158.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Reynolds (0 km)
- Silver City 5 W (23 km)
- Swan Falls Ph (30 km)
- Deer Flat Dam (41 km)
- Nampa Sugar Factory (47 km)
- Homedale 1 SE (47 km)
- Grand View 4 NW (51 km)
- Boise Air Terminal (58 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.