Frost dates for Anvil Rch, AZ
At Anvil Rch, the median last spring frost (32°F) is Mar 27 and the median first fall frost is Nov 9, for a typical growing season of 226 days. For a 90% chance that the last frost has passed, wait until Apr 18. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 27Last spring frost (median)50% chance of 32°F after this date
- Apr 18Safer planting date10% chance of 32°F after this date
- Nov 9First fall frost (median)50% chance of 32°F by this date
- 226 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 | Mar 27 | Apr 13 | Apr 30 |
| 32°F | Mar 5 | Mar 27 | Apr 18 |
| 28°F | Feb 9 | Mar 6 | Apr 2 |
| 24°F | Jan 7 | Feb 13 | Mar 10 |
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 | Oct 16 | Nov 1 | Nov 15 |
| 32°F | Oct 25 | Nov 9 | Nov 26 |
| 28°F | Nov 2 | Nov 21 | Dec 9 |
| 24°F | Nov 14 | Dec 3 | Jan 1 |
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 | 171 days | 199 days | 221 days |
| 32°F | 197 days | 226 days | 255 days |
| 28°F | 227 days | 257 days | 286 days |
| 24°F | 260 days | 293 days | 332 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85736 | 8b | 15 to 20°F | 12 km |
| 85735 | 9a | 20 to 25°F | 15 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 USC00020287, at 31.9792, -111.3836, elevation 841 m (2,759 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 54.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Kitt Peak (20 km)
- Tucson 11 W (35 km)
- Tucson 17 NW (35 km)
- Green Valley (38 km)
- Tucson Intl Airport (44 km)
- Tucson U Of A #1 (47 km)
- Tucson WFO (49 km)
- Tucson Camp Ave Exp. (53 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.