Frost dates for Flagstaff Pulliam Airport, AZ
At Flagstaff Pulliam Airport, the median last spring frost (32°F) is Jun 4 and the median first fall frost is Sep 28, for a typical growing season of 115 days. For a 90% chance that the last frost has passed, wait until Jun 19. Nearby ZIP codes are in USDA hardiness zone 6a.
- Jun 4Last spring frost (median)50% chance of 32°F after this date
- Jun 19Safer planting date10% chance of 32°F after this date
- Sep 28First fall frost (median)50% chance of 32°F by this date
- 115 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 | Jun 3 | Jun 16 | Jul 1 |
| 32°F | May 21 | Jun 4 | Jun 19 |
| 28°F | May 1 | May 20 | Jun 6 |
| 24°F | Apr 15 | May 1 | May 19 |
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 6 | Sep 19 | Sep 28 |
| 32°F | Sep 16 | Sep 28 | Oct 9 |
| 28°F | Sep 28 | Oct 9 | Oct 22 |
| 24°F | Oct 7 | Oct 20 | Nov 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 | 73 days | 92 days | 109 days |
| 32°F | 96 days | 115 days | 133 days |
| 28°F | 117 days | 139 days | 162 days |
| 24°F | 148 days | 170 days | 192 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 |
|---|---|---|---|
| 86005 | 6a | -10 to -5°F | 8 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 USW00003103, at 35.1442, -111.6664, elevation 2134 m (7,003 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 202.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Flagstaff 4 SW (6 km)
- Walnut Canyon National Monument (15 km)
- Fort Valley (15 km)
- Bellemont WFO (17 km)
- Oak Creek Canyon (22 km)
- Mund's Park (23 km)
- Sunset Crater National Monument (27 km)
- Sedona (29 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.