When to plant in Belmont, CA
USDA Zone 10aBelmont, 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 ~329-day season lets Belmont gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 10a, frost is a minor factor for Belmont — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Belmont is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
REDWOOD CITY · 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 Belmont’s own odds, recorded at REDWOOD CITY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 31 | Feb 25 | Jan 25 | Nov 8 | Nov 25 | Dec 14 |
| 32°F | Feb 16 | Jan 17 | Dec 20 | Nov 24 | Dec 12 | Jan 14 |
| 28°F | Jan 22 | Dec 31 | Dec 14 | Dec 5 | Dec 26 | Jan 15 |
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 Belmont, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Belmont planting FAQ
When is the last spring frost in Belmont, CA?
Plan for the last spring frost in Belmont around January 17 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Belmont, CA?
The first fall frost in Belmont typically arrives around December 12 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Belmont in?
Belmont is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Belmont?
Belmont has about 329 frost-free days — a long growing season — between the average last spring frost (January 17) and first fall frost (December 12).
When should I plant tomatoes in Belmont?
For Belmont, sow tomatoes indoors about November 22–December 6 and move the seedlings out around January 24, after the last spring frost.
Never miss a window in Belmont
An email when it’s time to start seeds, transplant, and sow — timed to Belmont’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- San Carlos · 3 km
- San Mateo · 5 km
- Foster City · 7 km
- Redwood City · 7 km
- Hillsborough · 7 km
- North Fair Oaks · 9 km
- Burlingame · 10 km
- Millbrae · 13 km
Frost dates recorded at REDWOOD CITY, 6 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 Belmont, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00047339. Retrieved from https://blissgarden.com/california/belmont.