When to plant in Pleasanton, CA
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in Pleasanton, California — is derived from the closest NOAA station with complete climate normals.
Pleasanton enjoys a long ~290-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 9b, frost is a minor factor for Pleasanton — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Pleasanton is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
LIVERMORE · 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 Pleasanton’s own odds, recorded at LIVERMORE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 13 | Mar 25 | Feb 26 | Nov 4 | Nov 18 | Dec 2 |
| 32°F | Mar 13 | Feb 15 | Jan 12 | Nov 16 | Dec 2 | Dec 28 |
| 28°F | Feb 10 | Jan 10 | Dec 19 | Nov 29 | Dec 18 | Jan 17 |
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 Pleasanton, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Pleasanton planting FAQ
When is the last spring frost in Pleasanton, CA?
Plan for the last spring frost in Pleasanton around February 15 (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 Pleasanton, CA?
Expect Pleasanton's first fall frost near December 2 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Pleasanton in?
Pleasanton is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Pleasanton?
Pleasanton has about 290 frost-free days — a long growing season — between the average last spring frost (February 15) and first fall frost (December 2).
When should I plant tomatoes in Pleasanton?
For Pleasanton, sow tomatoes indoors about December 21–January 4 and move the seedlings out around February 22, after the last spring frost.
Never miss a window in Pleasanton
An email when it’s time to start seeds, transplant, and sow — timed to Pleasanton’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Dublin · 6 km
- Livermore · 11 km
- San Ramon · 12 km
- Union City · 14 km
- Fairview · 14 km
- Blackhawk · 16 km
- Castro Valley · 17 km
- Danville · 18 km
Frost dates recorded at LIVERMORE, 7 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 Pleasanton, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00044997. Retrieved from https://blissgarden.com/california/pleasanton.