USDA Hardiness Zone 9a
Frost Dates for 89115 — Las Vegas, Nevada
NOAA 1991–2020 normals from N Las Vegas, NV (1,898 ft), 3 miles west.
Updated
In Las Vegas, the last spring frost (32°F) is around February 1 in half of years and has passed by February 24 in nine years out of ten. The first fall frost comes around December 8, as early as November 23 one year in ten, leaving a typical freeze-free season of 311 days (NOAA, N Las Vegas, NV).
- Last spring frost
- February 1
- First fall frost
- December 8
- Growing season
- 311 days
- Hardiness zone
- 9a
50% probability
50% probability
freeze-free, 50%
20 to 25°F (-6.7 to -3.9°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 26 observed
NOAA normal
Frost risk by date in Las Vegas
Half of springs at N Las Vegas, NV see their last 32°F night by February 1; only one in ten is past it by January 2, and one in ten still has one after February 24. Planting tender crops after February 11 leaves a 30% risk of a frost on them, after February 17 20%, and after February 24 10%. The 23 days between the even-odds date and the one-in-ten date is wider than at 58% of the 38 Nevada stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by December 8 in half of years, as early as November 23 one year in ten, and holds off past December 27 one year in ten. A hard freeze of 28°F follows 13 days later, around December 21; in spring the one-in-ten date for 28°F is February 8, 16 days before the 32°F one. The freeze-free season lasts 311 days in a typical year, longer than at 89% of the 38 Nevada stations; it reaches 341 days one year in ten and falls short of 282 one year in ten. On average 18 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 19 days longer, to about February 20, and return around November 26. A 24°F night is unusual: 16% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jan 31 | Feb 5 | Feb 11 | Feb 16 | Feb 20 | Feb 24 | Feb 28 | Mar 3 | Mar 9 |
| 32°F99% of yrs | Jan 2 | Jan 10 | Jan 19 | Jan 26 | Feb 1 | Feb 5 | Feb 11 | Feb 17 | Feb 24 |
| 28°F73% of yrs | Dec 12 | Dec 20 | Dec 28 | Jan 1 | Jan 4 | Jan 11 | Jan 21 | Jan 31 | Feb 8 |
| 24°F16% of yrs | too rare for a date | ||||||||
| 20°F1% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 11 | Nov 16 | Nov 20 | Nov 23 | Nov 26 | Nov 28 | Dec 1 | Dec 5 | Dec 10 |
| 32°F99% of yrs | Nov 23 | Nov 27 | Dec 1 | Dec 5 | Dec 8 | Dec 11 | Dec 15 | Dec 20 | Dec 27 |
| 28°F73% of yrs | Dec 1 | Dec 8 | Dec 12 | Dec 16 | Dec 21 | Dec 26 | Dec 30 | Jan 5 | Jan 24 |
| 24°F16% of yrs | too rare for a date | ||||||||
| 20°F1% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at N Las Vegas, NV, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 89115 →Compare Las Vegas with another place →
Weather by month in Las Vegas
July is the warmest month at N Las Vegas, NV, averaging 106°F by day and 79°F at night; December is the coldest at 59°F and 37°F. A freezing night is all but certain in December (a 90% chance or more). From March to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 49% of years.
Warmth for growing adds up to 7,468 growing degree days a year (base 50°F), more than at 92% of the 38 Nevada stations. 40% of them (2,969) have built up by the end of June, and July adds the most, 1,317. Precipitation totals 4.4 inches a year, most in February (0.8") and least in June (0.0"); May to September bring 25% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 61 | 38 | 0.6 | 83% | 5 | 55 |
| Feb | 65 | 41 | 0.8 | 49% | 2 | 120 |
| Mar | 73 | 49 | 0.5 | 5% | <1 | 342 |
| Apr | 80 | 55 | 0.2 | 0% | 0 | 524 |
| May | 89 | 64 | 0.2 | 0% | 0 | 826 |
| Jun | 101 | 73 | 0.0 | 0% | 0 | 1101 |
| Jul | 106 | 79 | 0.3 | 0% | 0 | 1317 |
| Aug | 104 | 78 | 0.3 | 0% | 0 | 1266 |
| Sep | 97 | 70 | 0.3 | 0% | 0 | 994 |
| Oct | 84 | 57 | 0.4 | 0% | 0 | 640 |
| Nov | 70 | 45 | 0.3 | 29% | 1 | 236 |
| Dec | 59 | 37 | 0.5 | 91% | 9 | 45 |
Monthly normals 1991–2020 at N Las Vegas, NV (1,898 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Las Vegas Air Terminal, NV, 7 miles west of Las Vegas and 305 feet higher, has a last frost 8 days earlier (January 24), a first frost 2 days later (December 10), a season 12 days longer.
When it snows in Las Vegas, Nevada
Measurable snow is rare here: only 0 of 26 winters from 1991 to 2020 recorded 0.1 inch or more at N Las Vegas, NV, 2.7 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 89115
| When | What to do |
|---|---|
| November 23 – December 7 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| December 7 – December 21 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| January 4 – January 18 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| February 1 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by September 15 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 24 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| December 8 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 89115 is 3 miles from N Las Vegas, NV, which stands at 1,898 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 89031 (North Las Vegas). The 2023 USDA Plant Hardiness Zone Map lists ZIP 89115 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.