When to plant in Granite Bay, CA
USDA Zone 9bGranite Bay, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
With about 283 frost-free days, Granite Bay supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Granite Bay's nearest full-normals station sits about 18 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. Zone 9b is warm enough that Granite Bay can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Granite Bay is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
AUBURN · 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 Granite Bay’s own odds, recorded at AUBURN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 5 | Mar 2 | Oct 30 | Nov 19 | Dec 7 |
| 32°F | Apr 7 | Feb 25 | Jan 15 | Nov 15 | Dec 5 | Dec 31 |
| 28°F | Feb 25 | Jan 13 | Dec 19 | Dec 1 | Dec 22 | Jan 22 |
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 Granite Bay, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 31 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.
Granite Bay planting FAQ
When is the last spring frost in Granite Bay, CA?
On average, the last spring frost in Granite Bay is around February 25 (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 Granite Bay, CA?
Expect Granite Bay's first fall frost near December 5 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Granite Bay in?
Granite Bay is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Granite Bay?
There are roughly 283 frost-free days in Granite Bay (a long growing season), running from the average last frost around February 25 to the first fall frost near December 5.
When should I plant tomatoes in Granite Bay?
In Granite Bay, start tomato seeds indoors around December 31–January 14, then transplant seedlings outdoors around March 4 once the danger of frost has passed.
Never miss a window in Granite Bay
An email when it’s time to start seeds, transplant, and sow — timed to Granite Bay’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rocklin · 9 km
- Orangevale · 9 km
- Folsom · 11 km
- Citrus Heights · 13 km
- Roseville · 13 km
- El Dorado Hills · 14 km
- Fair Oaks · 14 km
- Lincoln · 17 km
Frost dates recorded at AUBURN, 18 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 Granite Bay, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00040383. Retrieved from https://blissgarden.com/california/granite-bay.