When to plant in San Bernardino, CA
USDA Zone 10aSan Bernardino, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
A generous ~326-day season lets San Bernardino gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Zone 10a is warm enough that San Bernardino can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
REDLANDS · 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 San Bernardino’s own odds, recorded at REDLANDS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 5 | Mar 2 | Jan 31 | Nov 17 | Dec 2 | Dec 19 |
| 32°F | Feb 28 | Jan 27 | Dec 21 | Dec 1 | Dec 19 | Jan 26 |
| 28°F | Feb 15 | Jan 7 | Dec 17 | Dec 13 | Jan 1 | Feb 13 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in San Bernardino, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
San Bernardino planting FAQ
When is the last spring frost in San Bernardino, CA?
On average, the last spring frost in San Bernardino is around January 27 (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 San Bernardino, CA?
In San Bernardino, the first 32°F freeze of fall lands around December 19 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is San Bernardino in?
San Bernardino is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in San Bernardino?
There are roughly 326 frost-free days in San Bernardino (a long growing season), running from the average last frost around January 27 to the first fall frost near December 19.
When should I plant tomatoes in San Bernardino?
In San Bernardino, start tomato seeds indoors around December 2–December 16, then transplant seedlings outdoors around February 3 once the danger of frost has passed.
Never miss a window in San Bernardino
An email when it’s time to start seeds, transplant, and sow — timed to San Bernardino’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Muscoy · 5 km
- Rialto · 9 km
- Colton · 10 km
- Loma Linda · 12 km
- Highland · 12 km
- Grand Terrace · 12 km
- Bloomington · 13 km
- Redlands · 15 km
Frost dates recorded at REDLANDS, 15 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 San Bernardino, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00047306. Retrieved from https://blissgarden.com/california/san-bernardino.