USDA Hardiness Zone 10a
Frost Dates for 85364 — Yuma, Arizona
NOAA 1991–2020 normals from Yuma Quartermaster Depot, AZ (160 ft), 2 miles northeast.
Updated
A freeze (32°F) reaches Yuma in 57% of winters. When it does, the first fall frost comes around December 28 and the last spring frost around January 8; after February 19 the chance of another is under 6%.
- Last spring frost
- January 8
- First fall frost
- December 28
- Winters with a freeze
- 57%
- Hardiness zone
- 10a
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
30 to 35°F (-1.1 to 1.7°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 20 observed
NOAA normal
Frost risk by date in Yuma
In the 57% of winters that bring a 32°F night, half of springs at Yuma Quartermaster Depot, AZ see their last 32°F night by January 8; only one in ten is past it by December 17, and one in ten still has one after February 19. Counting the winters with no freeze at all, the risk of a 32°F night after February 19 is under 6% and after January 8 28%. The 42 days between the even-odds date and the one-in-ten date is the widest of the 98 Arizona 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 28 in half of years, as early as December 11 one year in ten, and holds off past February 7 one year in ten. A hard freeze of 28°F is less common: it came in 19% of winters. The freeze-free season lasts 362 days in a typical year, the longest of the 98 Arizona stations; it reaches 365 days one year in ten and falls short of 323 one year in ten. On average 4 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 20 days longer, to about January 28, and return around December 16. A 24°F night is unusual: 5% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F96% of yrs | Dec 25 | Jan 2 | Jan 9 | Jan 16 | Jan 28 | Feb 5 | Feb 13 | Feb 21 | Feb 28 |
| 32°F57% of yrs | Dec 17 | Dec 25 | Dec 31 | Jan 2 | Jan 8 | Jan 17 | Jan 31 | Feb 7 | Feb 19 |
| 28°F19% of yrs | too rare for a date | ||||||||
| 24°F5% of yrs | too rare for a date | ||||||||
| 20°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F96% of yrs | Nov 29 | Dec 5 | Dec 8 | Dec 12 | Dec 16 | Dec 19 | Dec 23 | Dec 28 | Jan 5 |
| 32°F57% of yrs | Dec 11 | Dec 16 | Dec 21 | Dec 26 | Dec 28 | Jan 1 | Jan 7 | Jan 19 | Feb 7 |
| 28°F19% of yrs | too rare for a date | ||||||||
| 24°F5% of yrs | too rare for a date | ||||||||
| 20°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Yuma Quartermaster Depot, AZ, 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 85364 →Compare Yuma with another place →
Weather by month in Yuma
August is the warmest month at Yuma Quartermaster Depot, AZ, averaging 109°F by day and 77°F at night; December is the coldest at 69°F and 44°F. From March to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 16% of years.
Warmth for growing adds up to 8,984 growing degree days a year (base 50°F), more than at 96% of the 102 Arizona stations. 42% of them (3,790) have built up by the end of June, and August adds the most, 1,342. Precipitation totals 3.3 inches a year, most in December (0.8") and least in June (0.0"); May to September bring 24% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 71 | 45 | 0.4 | 26% | 1 | 250 |
| Feb | 75 | 47 | 0.3 | 16% | 1 | 303 |
| Mar | 82 | 52 | 0.4 | 0% | 0 | 526 |
| Apr | 89 | 56 | 0.1 | 0% | 0 | 671 |
| May | 97 | 62 | 0.1 | 0% | 0 | 911 |
| Jun | 106 | 69 | 0.0 | 0% | 0 | 1129 |
| Jul | 109 | 76 | 0.3 | 0% | 0 | 1316 |
| Aug | 109 | 77 | 0.3 | 0% | 0 | 1342 |
| Sep | 104 | 69 | 0.1 | 0% | 0 | 1091 |
| Oct | 93 | 59 | 0.2 | 0% | 0 | 804 |
| Nov | 79 | 50 | 0.3 | 0% | <1 | 439 |
| Dec | 69 | 44 | 0.8 | 33% | 2 | 202 |
Monthly normals 1991–2020 at Yuma Quartermaster Depot, AZ (160 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, Yuma Mcas, AZ, 4 miles southeast of Yuma, has a 32°F night in 8% of winters against 57% here, and a coolest-month low 3°F warmer (47°F).
When it snows in Yuma, Arizona
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Yuma Quartermaster Depot, AZ, 2.1 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 85364 is 2 miles from Yuma Quartermaster Depot, AZ, which stands at 160 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 85364 in zone 10a, the band where the coldest night of the year averaged 30 to 35°F (-1.1 to 1.7°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.