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Frost Dates for Spring Valley, NV

Last spring frost
Jan 20
First fall frost
Dec 15
Growing season
333 days
Hardiness zone
9a

In an average year around Spring Valley, NV, the last spring frost (32°F) is about Jan 20 and the first fall frost is about Dec 15, giving roughly a 333-day growing season. To be safe most years, wait until Dec 20 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.

Last spring frost - Spring Valley, NV
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Mar 4 Feb 11 Jan 19
Freeze (32°F) Feb 14 Jan 20 Dec 20
Hard (28°F) Jan 29 Dec 31 Dec 10
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Mar 4 Feb 26 Feb 21 Feb 16 Feb 11 Feb 6 Feb 2 Jan 29 Jan 19
32°F Feb 14 Feb 6 Feb 1 Jan 26 Jan 20 Jan 14 Jan 7 Dec 31 Dec 20
28°F Jan 29 Jan 17 Jan 9 Jan 5 Dec 31 Dec 29 Dec 23 Dec 17 Dec 10

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.

First fall frost - Spring Valley, NV
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Nov 18 Dec 3 Dec 17
Freeze (32°F) Nov 28 Dec 15 Jan 7
Hard (28°F) Dec 6 Dec 26 Jan 22
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Nov 18 Nov 23 Nov 26 Nov 30 Dec 3 Dec 5 Dec 8 Dec 12 Dec 17
32°F Nov 28 Dec 4 Dec 8 Dec 12 Dec 15 Dec 19 Dec 23 Dec 29 Jan 7
28°F Dec 6 Dec 11 Dec 16 Dec 22 Dec 26 Dec 30 Jan 1 Jan 8 Jan 22

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

These dates are computed from the nearest official weather station with long-term records: Las Vegas Mccarran Ap, Nv, about 3.9 miles away@if(!empty($station['elevation_ft'])), at 2,131 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.

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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 Spring Valley, NV?

On average, the last spring frost (32°F) around Spring Valley, NV is about Jan 20. In cooler years it can run later, so for a safer bet many gardeners wait until Dec 20.

When is the first frost in the fall?

The first fall frost around Spring Valley, NV typically arrives about Dec 15. 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 Jan 20 on average, or Dec 20 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 333 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 89103 Planting calendar → Nevada frost dates →

Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026