Frost dates for Montezuma Castle National Monument, AZ
At Montezuma Castle National Monument, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 30, for a typical growing season of 196 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Oct 30First fall frost (median)50% chance of 32°F by this date
- 196 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 18 | May 1 | May 16 |
| 32°F | Mar 28 | Apr 16 | May 2 |
| 28°F | Mar 2 | Mar 21 | Apr 15 |
| 24°F | Feb 6 | Feb 28 | Mar 17 |
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 4 | Oct 19 | Nov 2 |
| 32°F | Oct 15 | Oct 30 | Nov 13 |
| 28°F | Oct 25 | Nov 10 | Nov 23 |
| 24°F | Nov 5 | Nov 20 | Dec 5 |
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 | 147 days | 169 days | 189 days |
| 32°F | 173 days | 196 days | 221 days |
| 28°F | 204 days | 230 days | 255 days |
| 24°F | 241 days | 264 days | 289 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 |
|---|---|---|---|
| 86322 | 8b | 15 to 20°F | 16 km |
| 86335 | 8a | 10 to 15°F | 17 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 USC00025635, at 34.6106, -111.8381, elevation 969 m (3,180 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 98.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Tuzigoot (25 km)
- Jerome (30 km)
- Childs (32 km)
- Sedona (32 km)
- Oak Creek Canyon (40 km)
- Mund's Park (41 km)
- Happy Jack Ranger Station (42 km)
- Cordes (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.