When to plant in Diamond Springs, CA
USDA Zone 9bDiamond Springs, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 9b, frost is a minor factor for Diamond Springs — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Diamond Springs is now 13 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
PLACERVILLE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Diamond Springs’s own odds, recorded at PLACERVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 14 | Apr 23 | Apr 6 | Oct 17 | Nov 6 | Nov 22 |
| 32°F | Apr 23 | Mar 31 | Feb 24 | Nov 1 | Nov 21 | Dec 7 |
| 28°F | Mar 21 | Feb 15 | Jan 14 | Nov 19 | Dec 5 | Jan 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Diamond Springs, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Diamond Springs planting FAQ
When is the last spring frost in Diamond Springs, CA?
On average, the last spring frost in Diamond Springs is around March 31 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Diamond Springs, CA?
The first fall frost in Diamond Springs typically arrives around November 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Diamond Springs in?
Diamond Springs is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Diamond Springs?
Diamond Springs has about 235 frost-free days — a long growing season — between the average last spring frost (March 31) and first fall frost (November 21).
When should I plant tomatoes in Diamond Springs?
For Diamond Springs, sow tomatoes indoors about February 3–February 17 and move the seedlings out around April 7, after the last spring frost.
Never miss a window in Diamond Springs
An email when it’s time to start seeds, transplant, and sow — timed to Diamond Springs’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Placerville · 6 km
- Cameron Park · 13 km
- El Dorado Hills · 18 km
- Folsom · 26 km
- Granite Bay · 30 km
- Auburn · 31 km
- Orangevale · 33 km
- North Auburn · 34 km
Frost dates recorded at PLACERVILLE, 1 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Diamond Springs, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00046960. Retrieved from https://blissgarden.com/california/diamond-springs.