Frost dates for Tonopah, NV
At Tonopah, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 18, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 24. Nearby ZIP codes are in USDA hardiness zones 6a to 7b.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 24Safer planting date10% chance of 32°F after this date
- Oct 18First fall frost (median)50% chance of 32°F by this date
- 169 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 30 | May 18 | Jun 6 |
| 32°F | Apr 13 | Apr 30 | May 24 |
| 28°F | Mar 30 | Apr 17 | May 8 |
| 24°F | Mar 9 | Apr 3 | Apr 22 |
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 25 | Oct 8 | Oct 21 |
| 32°F | Oct 4 | Oct 18 | Nov 1 |
| 28°F | Oct 14 | Oct 28 | Nov 10 |
| 24°F | Oct 21 | Nov 7 | Nov 19 |
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 | 119 days | 143 days | 165 days |
| 32°F | 146 days | 169 days | 189 days |
| 28°F | 170 days | 193 days | 215 days |
| 24°F | 191 days | 216 days | 245 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 89022 | 6b | -5 to 0°F | 52 km |
| 89047 | 7a | 0 to 5°F | 58 km |
| 89049 | 6b | -5 to 0°F | 71 km |
| 89013 | 7b | 5 to 10°F | 77 km |
| 89010 | 7a | 0 to 5°F | 90 km |
| 89045 | 6a | -10 to -5°F | 91 km |
| 89422 | 7a | 0 to 5°F | 104 km |
| 89409 | 6b | -5 to 0°F | 106 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 USW00023153, at 38.0511, -117.0903, elevation 1644 m (5,395 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 148.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Tonopah (13 km)
- Goldfield (40 km)
- Silverpeak (53 km)
- Twin Spring Fallini (82 km)
- Smoky Valley - Carvers (82 km)
- Dyer 5s (94 km)
- Mina (97 km)
- Reese River Ione 13ne (116 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.