Frost dates for Sunset Crater National Monument, AZ
At Sunset Crater National Monument, the median last spring frost (32°F) is Jun 16 and the median first fall frost is Sep 19, for a typical growing season of 94 days. For a 90% chance that the last frost has passed, wait until Jun 29. Nearby ZIP codes are in USDA hardiness zone 6b.
- Jun 16Last spring frost (median)50% chance of 32°F after this date
- Jun 29Safer planting date10% chance of 32°F after this date
- Sep 19First fall frost (median)50% chance of 32°F by this date
- 94 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 |
|---|---|---|---|
| 32°F | Jun 3 | Jun 16 | Jun 29 |
| 28°F | May 22 | Jun 5 | Jun 20 |
| 24°F | May 6 | May 24 | Jun 9 |
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 |
|---|---|---|---|
| 32°F | Aug 31 | Sep 19 | Sep 30 |
| 28°F | Sep 14 | Sep 28 | Oct 9 |
| 24°F | Sep 23 | Oct 5 | Oct 18 |
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 | 41 days | 68 days | 89 days |
| 32°F | 71 days | 94 days | 110 days |
| 28°F | 94 days | 113 days | 131 days |
| 24°F | 111 days | 133 days | 154 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 |
|---|---|---|---|
| 86004 | 6b | -5 to 0°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 USC00028329, at 35.3694, -111.5436, elevation 2128 m (6,980 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 214.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Fort Valley (21 km)
- Walnut Canyon National Monument (22 km)
- Wupatki National Monument (23 km)
- Flagstaff Pulliam Airport (27 km)
- Flagstaff 4 SW (29 km)
- Bellemont WFO (30 km)
- Twin Arrows (34 km)
- Mund's Park (49 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.