When to plant in Greenfield, CA
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Greenfield, California — all computed from Greenfield's nearest NOAA weather station.
With about 272 frost-free days, Greenfield supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Heads up: the nearest complete-normals station is about 16 km from Greenfield, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. Zone 9b is warm enough that Greenfield can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Greenfield is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
KING 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 Greenfield’s own odds, recorded at KING CITY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 29 | Apr 7 | Mar 5 | Oct 17 | Nov 4 | Nov 22 |
| 32°F | Mar 31 | Feb 23 | Jan 19 | Nov 1 | Nov 22 | Dec 11 |
| 28°F | Feb 21 | Jan 22 | Dec 18 | Nov 19 | Dec 6 | Jan 10 |
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 Greenfield, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 44 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.
Greenfield planting FAQ
When is the last spring frost in Greenfield, CA?
On average, the last spring frost in Greenfield is around February 23 (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 Greenfield, CA?
The first fall frost in Greenfield typically arrives around November 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Greenfield in?
Greenfield is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Greenfield?
There are roughly 272 frost-free days in Greenfield (a long growing season), running from the average last frost around February 23 to the first fall frost near November 22.
When should I plant tomatoes in Greenfield?
In Greenfield, start tomato seeds indoors around December 29–January 12, then transplant seedlings outdoors around March 2 once the danger of frost has passed.
Never miss a window in Greenfield
An email when it’s time to start seeds, transplant, and sow — timed to Greenfield’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at KING CITY, 16 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 Greenfield, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00044555. Retrieved from https://blissgarden.com/california/greenfield.