When to plant in Concord, CA
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Concord, California — all computed from Concord's nearest NOAA weather station.
Concord enjoys a long ~339-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Zone 9b is warm enough that Concord can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Concord is now 13 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CONCORD BUCHANAN FLD · 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 Concord’s own odds, recorded at CONCORD BUCHANAN FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 13 | Feb 14 | Jan 12 | Nov 14 | Dec 1 | Dec 26 |
| 32°F | Feb 12 | Jan 9 | Dec 16 | Nov 28 | Dec 14 | Jan 16 |
| 28°F | Jan 19 | Dec 30 | Dec 10 | Dec 5 | Dec 23 | Jan 12 |
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 Concord, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 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.
Concord planting FAQ
When is the last spring frost in Concord, CA?
Plan for the last spring frost in Concord around January 9 (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 Concord, CA?
The first fall frost in Concord typically arrives around December 14 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Concord in?
Concord is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Concord?
There are roughly 339 frost-free days in Concord (a long growing season), running from the average last frost around January 9 to the first fall frost near December 14.
When should I plant tomatoes in Concord?
In Concord, start tomato seeds indoors around November 14–November 28, then transplant seedlings outdoors around January 16 once the danger of frost has passed.
Never miss a window in Concord
An email when it’s time to start seeds, transplant, and sow — timed to Concord’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Pleasant Hill · 7 km
- Clayton · 7 km
- Bay Point · 8 km
- Walnut Creek · 8 km
- Pittsburg · 10 km
- Martinez · 10 km
- Alamo · 13 km
- Lafayette · 14 km
Frost dates recorded at CONCORD BUCHANAN FLD, 5 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 Concord, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00023254. Retrieved from https://blissgarden.com/california/concord.