When to plant in Coronado, CA
USDA Zone 10bCoronado, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Coronado enjoys a long ~359-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. These dates come from a station roughly 19 km away, the closest with full normals; terrain around Coronado (elevation, water, pavement) can move your real frost dates a few days either way. Zone 10b is warm enough that Coronado can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
SAN DIEGO BROWN 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 Coronado’s own odds, recorded at SAN DIEGO BROWN FLD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 7 | Feb 2 | Dec 29 | Dec 1 | Dec 20 | Jan 25 |
| 32°F | Feb 5 | Jan 6 | Dec 13 | Dec 11 | Dec 31 | Jan 30 |
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 Coronado, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 41 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.
Coronado planting FAQ
When is the last spring frost in Coronado, CA?
Plan for the last spring frost in Coronado around January 6 (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 Coronado, CA?
In Coronado, the first 32°F freeze of fall lands around December 31 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Coronado in?
Coronado is in USDA hardiness zone 10b. In zone 10b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Coronado?
There are roughly 359 frost-free days in Coronado (a long growing season), running from the average last frost around January 6 to the first fall frost near December 31.
When should I plant tomatoes in Coronado?
In Coronado, start tomato seeds indoors around November 11–November 25, then transplant seedlings outdoors around January 13 once the danger of frost has passed.
Never miss a window in Coronado
An email when it’s time to start seeds, transplant, and sow — timed to Coronado’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- National City · 5 km
- Imperial Beach · 11 km
- Chula Vista · 14 km
- Bonita · 14 km
- Lemon Grove · 14 km
- La Presa · 16 km
- La Mesa · 18 km
- Spring Valley · 19 km
Frost dates recorded at SAN DIEGO BROWN FLD, 19 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 Coronado, CA — Frost Dates & Zone 10b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003178. Retrieved from https://blissgarden.com/california/coronado.