When to plant in Santa Clara, CA
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Santa Clara, California — is derived from the closest NOAA station with complete climate normals.
With about 344 frost-free days, Santa Clara supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Zone 9b is warm enough that Santa Clara can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
SAN JOSE · 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 Santa Clara’s own odds, recorded at SAN JOSE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 9 | Feb 12 | Jan 11 | Nov 17 | Dec 3 | Dec 31 |
| 32°F | Feb 14 | Jan 12 | Dec 20 | Dec 1 | Dec 22 | Jan 20 |
| 28°F | Jan 17 | Dec 31 | Dec 10 | Dec 6 | Dec 28 | Jan 14 |
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 Santa Clara, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 8 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.
Santa Clara planting FAQ
When is the last spring frost in Santa Clara, CA?
Santa Clara's average last spring frost falls near January 12 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Santa Clara, CA?
The first fall frost in Santa Clara typically arrives around December 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Santa Clara in?
Santa Clara is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Santa Clara?
There are roughly 344 frost-free days in Santa Clara (a long growing season), running from the average last frost around January 12 to the first fall frost near December 22.
When should I plant tomatoes in Santa Clara?
In Santa Clara, start tomato seeds indoors around November 17–December 1, then transplant seedlings outdoors around January 19 once the danger of frost has passed.
Never miss a window in Santa Clara
An email when it’s time to start seeds, transplant, and sow — timed to Santa Clara’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at SAN JOSE, 4 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 Santa Clara, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00023293. Retrieved from https://blissgarden.com/california/santa-clara.