Frost dates for Nogales Intl Airport, AZ
At Nogales Intl Airport, the median last spring frost (32°F) is Mar 20 and the median first fall frost is Nov 17, for a typical growing season of 239 days. For a 90% chance that the last frost has passed, wait until Apr 13. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Mar 20Last spring frost (median)50% chance of 32°F after this date
- Apr 13Safer planting date10% chance of 32°F after this date
- Nov 17First fall frost (median)50% chance of 32°F by this date
- 239 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 24 | Apr 13 | Apr 29 |
| 32°F | Feb 24 | Mar 20 | Apr 13 |
| 28°F | Jan 25 | Feb 23 | Mar 21 |
| 24°F | Dec 28 | Jan 31 | Feb 23 |
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 20 | Nov 5 | Nov 20 |
| 32°F | Oct 30 | Nov 17 | Dec 3 |
| 28°F | Nov 11 | Nov 30 | Dec 17 |
| 24°F | Nov 24 | Dec 17 | Jan 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 | 183 days | 205 days | 229 days |
| 32°F | 208 days | 239 days | 272 days |
| 28°F | 245 days | 279 days | 310 days |
| 24°F | 287 days | 322 days | 357 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 96% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85621 | 8b | 15 to 20°F | 6 km |
| 85624 | 8a | 10 to 15°F | 16 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 USW00003196, at 31.4208, -110.8458, elevation 1198 m (3,932 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 45.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Nogales 6 N (12 km)
- Tumacacori National Monument (25 km)
- Canelo 1 NW (34 km)
- Sonoita (34 km)
- Elgin 5 S (37 km)
- Santa Rita Exp. Range (38 km)
- Fort Huachuca Pioneer Airfield (45 km)
- Green Valley (54 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.