Last spring frost
May 19
Frost Dates for Humboldt River Ranch, NV
First fall frost
Sep 24
Growing season
125 days
Hardiness zone
6b
In an average year around Humboldt River Ranch, NV, the last spring frost (32°F) is about May 19 and the first fall frost is about Sep 24, giving roughly a 125-day growing season. To be safe most years, wait until May 2 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Jun 26 | Jun 4 | May 17 |
| Freeze (32°F) | Jun 9 | May 19 | May 2 |
| Hard (28°F) | May 26 | May 4 | Apr 19 |
| Severe (24°F) | May 12 | Apr 22 | Apr 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 26 | Jun 18 | Jun 13 | Jun 8 | Jun 4 | Jun 2 | May 30 | May 23 | May 17 |
| 32°F | Jun 9 | Jun 3 | May 30 | May 24 | May 19 | May 16 | May 12 | May 7 | May 2 |
| 28°F | May 26 | May 18 | May 13 | May 8 | May 4 | May 1 | Apr 28 | Apr 24 | Apr 19 |
| 24°F | May 12 | May 3 | Apr 28 | Apr 24 | Apr 22 | Apr 19 | Apr 16 | Apr 10 | Apr 4 |
| 20°F | Apr 27 | Apr 20 | Apr 16 | Apr 11 | Apr 6 | Apr 2 | Mar 30 | Mar 23 | Mar 12 |
| 16°F | Apr 12 | Apr 4 | Mar 30 | Mar 23 | Mar 14 | Mar 8 | Mar 2 | Feb 25 | Feb 16 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Aug 29 | Sep 12 | Sep 25 |
| Freeze (32°F) | Sep 9 | Sep 24 | Oct 7 |
| Hard (28°F) | Sep 21 | Oct 4 | Oct 20 |
| Severe (24°F) | Oct 1 | Oct 15 | Nov 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 29 | Sep 2 | Sep 6 | Sep 9 | Sep 12 | Sep 15 | Sep 18 | Sep 21 | Sep 25 |
| 32°F | Sep 9 | Sep 14 | Sep 18 | Sep 21 | Sep 24 | Sep 26 | Sep 29 | Oct 2 | Oct 7 |
| 28°F | Sep 21 | Sep 26 | Sep 29 | Oct 2 | Oct 4 | Oct 7 | Oct 10 | Oct 14 | Oct 20 |
| 24°F | Oct 1 | Oct 4 | Oct 7 | Oct 11 | Oct 15 | Oct 18 | Oct 22 | Oct 26 | Nov 1 |
| 20°F | Oct 9 | Oct 15 | Oct 20 | Oct 24 | Oct 27 | Oct 30 | Nov 2 | Nov 7 | Nov 13 |
| 16°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 6 | Nov 9 | Nov 14 | Nov 20 | Nov 24 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Rye Patch Dam, Nv, about 8.6 miles away@if(!empty($station['elevation_ft'])), at 4,135 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Humboldt River Ranch, NV?
On average, the last spring frost (32°F) around Humboldt River Ranch, NV is about May 19. In cooler years it can run later, so for a safer bet many gardeners wait until May 2.
When is the first frost in the fall?
The first fall frost around Humboldt River Ranch, NV typically arrives about Sep 24. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 19 on average, or May 2 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 125 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 89419 Planting calendar → Nevada frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026