USDA Hardiness Zone 9b
Frost Dates for 95903 — Beale Afb, California
NOAA 1991–2020 normals from Marysville Yuba Co Airport, CA (62 ft), 11 miles west.
Updated
In Beale Afb, the last spring frost (32°F) is around February 11 in half of years and has passed by March 12 in nine years out of ten. The first fall frost comes around November 30, as early as November 12 one year in ten, leaving a typical freeze-free season of 289 days (NOAA, Marysville Yuba Co Airport, CA).
- Last spring frost
- February 11
- First fall frost
- November 30
- Growing season
- 289 days
- Hardiness zone
- 9b
50% probability
50% probability
freeze-free, 50%
25 to 30°F (-3.9 to -1.1°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 27 observed
NOAA normal
Frost risk by date in Beale Afb
Half of springs at Marysville Yuba Co Airport, CA see their last 32°F night by February 11; only one in ten is past it by January 6, and one in ten still has one after March 12. Planting tender crops after February 26 leaves a 30% risk of a frost on them, after March 5 20%, and after March 12 10%. The 29 days between the even-odds date and the one-in-ten date is narrower than at 52% of the 220 California 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 November 30 in half of years, as early as November 12 one year in ten, and holds off past December 21 one year in ten. A hard freeze of 28°F follows 13 days later, around December 13; in spring the one-in-ten date for 28°F is February 10, 30 days before the 32°F one. The freeze-free season lasts 289 days in a typical year, longer than at 58% of the 219 California stations; it reaches 329 days one year in ten and falls short of 248 one year in ten. On average 23 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 38 days longer, to about March 21, and return around November 14. A 24°F night is unusual: 33% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Feb 20 | Mar 2 | Mar 9 | Mar 15 | Mar 21 | Mar 28 | Apr 2 | Apr 9 | Apr 16 |
| 32°F | Jan 6 | Jan 19 | Jan 29 | Feb 3 | Feb 11 | Feb 19 | Feb 26 | Mar 5 | Mar 12 |
| 28°F81% of yrs | Dec 14 | Dec 24 | Dec 31 | Jan 6 | Jan 12 | Jan 18 | Jan 25 | Jan 31 | Feb 10 |
| 24°F33% of yrs | too rare for a date | ||||||||
| 20°F4% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 30 | Nov 4 | Nov 8 | Nov 11 | Nov 14 | Nov 17 | Nov 20 | Nov 25 | Dec 1 |
| 32°F | Nov 12 | Nov 17 | Nov 22 | Nov 26 | Nov 30 | Dec 2 | Dec 7 | Dec 12 | Dec 21 |
| 28°F81% of yrs | Nov 24 | Dec 1 | Dec 4 | Dec 8 | Dec 13 | Dec 18 | Dec 25 | Jan 2 | Jan 11 |
| 24°F33% of yrs | too rare for a date | ||||||||
| 20°F4% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Marysville Yuba Co Airport, CA, 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 95903 →Compare Beale Afb with another place →
Weather by month in Beale Afb
July is the warmest month at Marysville Yuba Co Airport, CA, averaging 96°F by day and 61°F at night; December is the coldest at 55°F and 38°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 52% of years and March still brings one in 23% of years.
Warmth for growing adds up to 4,773 growing degree days a year (base 50°F), more than at 58% of the 283 California stations. 38% of them (1,791) have built up by the end of June, and July adds the most, 882. Precipitation totals 20.1 inches a year, most in January (3.8") and least in July (0.0"); May to September bring 7% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 56 | 38 | 3.8 | 86% | 8 | 20 |
| Feb | 60 | 41 | 3.7 | 52% | 3 | 68 |
| Mar | 66 | 43 | 2.9 | 23% | <1 | 165 |
| Apr | 73 | 46 | 1.4 | 3% | <1 | 287 |
| May | 82 | 52 | 0.9 | 0% | 0 | 532 |
| Jun | 90 | 58 | 0.3 | 0% | 0 | 720 |
| Jul | 96 | 61 | 0.0 | 0% | 0 | 882 |
| Aug | 95 | 60 | 0.1 | 0% | 0 | 837 |
| Sep | 90 | 56 | 0.1 | 0% | 0 | 680 |
| Oct | 79 | 49 | 1.0 | 2% | 0 | 441 |
| Nov | 64 | 41 | 2.2 | 50% | 3 | 119 |
| Dec | 55 | 38 | 3.7 | 85% | 9 | 23 |
Monthly normals 1991–2020 at Marysville Yuba Co Airport, CA (62 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, Marysville, CA, 12 miles west of Beale Afb, has a last frost 27 days earlier (January 15), a first frost 12 days later (December 12), a season 44 days longer.
When it snows in Beale Afb, California
Measurable snow is rare here: only 0 of 27 winters from 1991 to 2020 recorded 0.1 inch or more at Harry L Englebright Dam, CA, 9.4 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 95903
| When | What to do |
|---|---|
| December 3 – December 17 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| December 17 – December 31 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| January 14 – January 28 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| February 11 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by September 7 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 16 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 30 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 95903 is 11 miles from Marysville Yuba Co Airport, CA, which stands at 62 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 95961 (Olivehurst). The 2023 USDA Plant Hardiness Zone Map lists ZIP 95903 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across California →
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.