Frost dates for Twin Arrows, AZ
At Twin Arrows, the median last spring frost (32°F) is Apr 14 and the median first fall frost is Oct 25, for a typical growing season of 192 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 14Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 192 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 16 | May 2 | May 19 |
| 32°F | Mar 31 | Apr 14 | May 4 |
| 28°F | Mar 12 | Mar 30 | Apr 14 |
| 24°F | Feb 22 | Mar 11 | Apr 2 |
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 3 | Oct 14 | Oct 30 |
| 32°F | Oct 11 | Oct 25 | Nov 12 |
| 28°F | Oct 19 | Nov 7 | Nov 25 |
| 24°F | Oct 29 | Nov 20 | Dec 6 |
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 | 140 days | 163 days | 186 days |
| 32°F | 168 days | 192 days | 218 days |
| 28°F | 195 days | 222 days | 246 days |
| 24°F | 223 days | 248 days | 274 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 |
|---|---|---|---|
| 86003 | 7a | 0 to 5°F | 10 km |
| 86035 | 7a | 0 to 5°F | 33 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 USC00028910, at 35.1664, -111.2592, elevation 1772 m (5,815 ft).
- Data quality: Estimated from nearby stations (2+ years), 3 years of freeze data.
- Average days per year at or below 32°F: 103.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Walnut Canyon National Monument (23 km)
- Meteor Crater (26 km)
- Sunset Crater National Monument (34 km)
- Flagstaff Pulliam Airport (37 km)
- Wupatki National Monument (41 km)
- Flagstaff 4 SW (43 km)
- Mund's Park (43 km)
- Fort Valley (45 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.