Frost dates for Dunsmuir Trtmt Pl, CA
At Dunsmuir Trtmt Pl, the median last spring frost (32°F) is Apr 23 and the median first fall frost is Oct 27, for a typical growing season of 185 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Apr 23Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 185 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 | Apr 27 | May 11 | Jun 3 |
| 32°F | Apr 5 | Apr 23 | May 12 |
| 28°F | Mar 1 | Mar 31 | Apr 21 |
| 24°F | Jan 11 | Feb 20 | Mar 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 |
|---|---|---|---|
| 36°F | Sep 23 | Oct 9 | Oct 24 |
| 32°F | Oct 9 | Oct 27 | Nov 10 |
| 28°F | Oct 28 | Nov 12 | Dec 2 |
| 24°F | Nov 11 | Dec 3 | Jan 3 |
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 | 123 days | 149 days | 172 days |
| 32°F | 158 days | 185 days | 208 days |
| 28°F | 197 days | 225 days | 259 days |
| 24°F | 243 days | 285 days | 328 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 99% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 96025 | 8a | 10 to 15°F | 4 km |
| 96017 | 8b | 15 to 20°F | 9 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 USC00042574, at 41.1831, -122.2817, elevation 661 m (2,169 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 105.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- McCloud (14 km)
- Mount Shasta (16 km)
- Mount Shasta (17 km)
- Callahan (49 km)
- Shasta Dam (53 km)
- Burney (62 km)
- Yreka (65 km)
- Redding 12 WNW (65 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.