When to plant in Walnut Park, CA
USDA Zone 10bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Walnut Park, California — all computed from Walnut Park's nearest NOAA weather station.
A ~-2-day frost-free window makes Walnut Park a short-season garden: choose early varieties and start long-season crops indoors well ahead of the last frost. Walnut Park's nearest full-normals station sits about 17 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. Zone 10b is warm enough that Walnut Park can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
SAN GABRIEL FIRE DEPT · 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 Walnut Park’s own odds, recorded at SAN GABRIEL FIRE DEPT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Feb 20 | Jan 17 | Dec 20 | Dec 6 | Dec 26 | Jan 30 |
| 32°F | Jan 28 | Jan 4 | Dec 19 | Dec 18 | Jan 2 | Jan 26 |
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 Walnut Park, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Walnut Park planting FAQ
When is the last spring frost in Walnut Park, CA?
Plan for the last spring frost in Walnut Park around January 4 (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 Walnut Park, CA?
Expect Walnut Park's first fall frost near January 2 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Walnut Park in?
Walnut Park is in USDA hardiness zone 10b. In zone 10b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Walnut Park?
There are roughly -2 frost-free days in Walnut Park (a short growing season), running from the average last frost around January 4 to the first fall frost near January 2.
When should I plant tomatoes in Walnut Park?
In Walnut Park, start tomato seeds indoors around November 9–November 23, then transplant seedlings outdoors around January 11 once the danger of frost has passed.
Never miss a window in Walnut Park
An email when it’s time to start seeds, transplant, and sow — timed to Walnut Park’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Huntington Park · 1 km
- Florence-Graham · 2 km
- Cudahy · 4 km
- South Gate · 4 km
- Maywood · 4 km
- Bell · 4 km
- Lynwood · 5 km
- Willowbrook · 5 km
Frost dates recorded at SAN GABRIEL FIRE DEPT, 17 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 Walnut Park, CA — Frost Dates & Zone 10b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00047785. Retrieved from https://blissgarden.com/california/walnut-park.