Harman US

Frost Dates for Moapa Valley, NV

Last spring frost
Jan 23
First fall frost
Dec 13
Growing season
327 days
Hardiness zone
9b

In an average year around Moapa Valley, NV, the last spring frost (32°F) is about Jan 23 and the first fall frost is about Dec 13, giving roughly a 327-day growing season. To be safe most years, wait until Dec 27 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 - Moapa Valley, NV
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Mar 11 Feb 18 Jan 26
Freeze (32°F) Feb 19 Jan 23 Dec 27
Hard (28°F) Feb 3 Jan 3 Dec 10
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Mar 11 Mar 4 Feb 28 Feb 24 Feb 18 Feb 14 Feb 9 Feb 3 Jan 26
32°F Feb 19 Feb 11 Feb 3 Jan 30 Jan 23 Jan 18 Jan 12 Jan 4 Dec 27
28°F Feb 3 Jan 22 Jan 15 Jan 9 Jan 3 Dec 31 Dec 24 Dec 16 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 - Moapa Valley, NV
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Nov 16 Dec 3 Dec 17
Freeze (32°F) Nov 27 Dec 13 Jan 5
Hard (28°F) Dec 5 Dec 26 Jan 21
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Nov 16 Nov 22 Nov 27 Nov 30 Dec 3 Dec 6 Dec 9 Dec 12 Dec 17
32°F Nov 27 Dec 3 Dec 7 Dec 10 Dec 13 Dec 18 Dec 23 Dec 29 Jan 5
28°F Dec 5 Dec 10 Dec 15 Dec 20 Dec 26 Dec 30 Jan 3 Jan 9 Jan 21

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: Valley Of Fire Sp, Nv, about 5.6 miles away@if(!empty($station['elevation_ft'])), at 2,000 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.

@endif
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 Moapa Valley, NV?

On average, the last spring frost (32°F) around Moapa Valley, NV is about Jan 23. In cooler years it can run later, so for a safer bet many gardeners wait until Dec 27.

When is the first frost in the fall?

The first fall frost around Moapa Valley, NV typically arrives about Dec 13. 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 23 on average, or Dec 27 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 327 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 89040 Planting calendar → Nevada frost dates →

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