USDA Hardiness Zone 9b
Frost Dates for 95619 — Diamond Springs, California
NOAA 1991–2020 normals from Placerville, CA (1,850 ft), under a mile northwest.
Updated
In Diamond Springs, the last spring frost (32°F) is around March 31 in half of years and has passed by April 23 in nine years out of ten. The first fall frost comes around November 21, as early as November 1 one year in ten, leaving a typical freeze-free season of 237 days (NOAA, Placerville, CA).
- Last spring frost
- March 31
- First fall frost
- November 21
- Growing season
- 237 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
- 5%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
1 of 20 observed
NOAA normal
Frost risk by date in Diamond Springs
Half of springs at Placerville, CA see their last 32°F night by March 31; only one in ten is past it by February 24, and one in ten still has one after April 23. Planting tender crops after April 11 leaves a 30% risk of a frost on them, after April 17 20%, and after April 23 10%. The 23 days between the even-odds date and the one-in-ten date is narrower than at 78% 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 21 in half of years, as early as November 1 one year in ten, and holds off past December 7 one year in ten. A hard freeze of 28°F follows 14 days later, around December 5; in spring the one-in-ten date for 28°F is March 21, 33 days before the 32°F one. The freeze-free season lasts 237 days in a typical year, shorter than at 71% of the 219 California stations; it reaches 275 days one year in ten and falls short of 204 one year in ten. On average 30 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 23 days longer, to about April 23, and return around November 6. Nights of 24°F, cold enough to damage hardier plants, come in 82% of winters and 16°F in 4%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 6 | Apr 11 | Apr 16 | Apr 20 | Apr 23 | Apr 27 | Apr 30 | May 5 | May 14 |
| 32°F | Feb 24 | Mar 4 | Mar 12 | Mar 22 | Mar 31 | Apr 5 | Apr 11 | Apr 17 | Apr 23 |
| 28°F | Jan 14 | Jan 26 | Feb 3 | Feb 8 | Feb 15 | Feb 22 | Feb 28 | Mar 6 | Mar 21 |
| 24°F82% of yrs | Dec 19 | Dec 28 | Jan 3 | Jan 9 | Jan 15 | Jan 24 | Feb 1 | Feb 9 | Feb 21 |
| 20°F31% of yrs | too rare for a date | ||||||||
| 16°F4% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 17 | Oct 25 | Oct 30 | Nov 2 | Nov 6 | Nov 10 | Nov 13 | Nov 17 | Nov 22 |
| 32°F | Nov 1 | Nov 9 | Nov 14 | Nov 18 | Nov 21 | Nov 25 | Nov 28 | Dec 2 | Dec 7 |
| 28°F | Nov 19 | Nov 25 | Nov 29 | Dec 2 | Dec 5 | Dec 9 | Dec 13 | Dec 20 | Jan 1 |
| 24°F82% of yrs | Dec 1 | Dec 6 | Dec 11 | Dec 14 | Dec 18 | Dec 27 | Jan 1 | Jan 11 | Jan 28 |
| 20°F31% of yrs | too rare for a date | ||||||||
| 16°F4% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Placerville, 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 95619 →Compare Diamond Springs with another place →
Weather by month in Diamond Springs
July is the warmest month at Placerville, CA, averaging 94°F by day and 61°F at night; December is the coldest at 56°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 71% of years and April still brings one in 45% of years.
Warmth for growing adds up to 4,181 growing degree days a year (base 50°F), fewer than at 56% of the 283 California stations. 32% of them (1,333) have built up by the end of June, and July adds the most, 849.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 57 | 34 | 99% | 9 | 19 |
| Feb | 60 | 37 | 92% | 4 | 43 |
| Mar | 63 | 40 | 71% | 3 | 109 |
| Apr | 67 | 42 | 45% | 1 | 172 |
| May | 76 | 48 | 5% | 0 | 386 |
| Jun | 86 | 55 | 0% | 0 | 605 |
| Jul | 94 | 61 | 0% | 0 | 849 |
| Aug | 93 | 59 | 0% | 0 | 812 |
| Sep | 88 | 56 | 0% | 0 | 659 |
| Oct | 77 | 48 | 9% | <1 | 395 |
| Nov | 65 | 40 | 73% | 3 | 119 |
| Dec | 56 | 34 | 99% | 10 | 16 |
Monthly normals 1991–2020 at Placerville, CA (1,850 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, Georgetown Rs, CA, 17 miles north of Diamond Springs and 1,151 feet higher, has a last frost 12 days later (April 12), the same first-frost date, a season 16 days shorter.
When it snows in Diamond Springs, California
Measurable snow is rare here: only 1 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Placerville, CA, 0.5 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 95619
| When | What to do |
|---|---|
| January 20 – February 3 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 3 – February 17 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 3 – March 17 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 31 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 29 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 7 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 21 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 95619 is under a mile from Placerville, CA, which stands at 1,850 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 95762 (El Dorado Hills). The 2023 USDA Plant Hardiness Zone Map lists ZIP 95619 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.