When to plant in Seal Beach, CA
USDA Zone 10aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Seal Beach, California — all computed from Seal Beach's nearest NOAA weather station.
With only about -4 frost-free days, Seal Beach has a short season — start heat-lovers indoors early, favor quick-maturing varieties, and use row cover to stretch both ends. These dates come from a station roughly 25 km away, the closest with full normals; terrain around Seal Beach (elevation, water, pavement) can move your real frost dates a few days either way. Zone 10a is warm enough that Seal Beach can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
TORRANCE AP · 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 Seal Beach’s own odds, recorded at TORRANCE AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 5 | Jan 17 | Dec 12 | Dec 1 | Dec 31 | Feb 20 |
| 32°F | Feb 24 | Jan 9 | Dec 4 | Dec 3 | Jan 5 | Feb 22 |
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 Seal Beach, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 36 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.
Seal Beach planting FAQ
When is the last spring frost in Seal Beach, CA?
Seal Beach's average last spring frost falls near January 9 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Seal Beach, CA?
Expect Seal Beach's first fall frost near January 5 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Seal Beach in?
Seal Beach is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Seal Beach?
There are roughly -4 frost-free days in Seal Beach (a short growing season), running from the average last frost around January 9 to the first fall frost near January 5.
When should I plant tomatoes in Seal Beach?
In Seal Beach, 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 Seal Beach
An email when it’s time to start seeds, transplant, and sow — timed to Seal Beach’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rossmoor · 4 km
- Los Alamitos · 5 km
- Westminster · 7 km
- Cypress · 8 km
- Hawaiian Gardens · 8 km
- Stanton · 9 km
- Huntington Beach · 9 km
- Long Beach · 9 km
Frost dates recorded at TORRANCE AP, 25 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 Seal Beach, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003122. Retrieved from https://blissgarden.com/california/seal-beach.