When to plant in Grand Terrace, CA
USDA Zone 10aGrand Terrace, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
A ~-8-day frost-free window makes Grand Terrace a short-season garden: choose early varieties and start long-season crops indoors well ahead of the last frost. In zone 10a, frost is a minor factor for Grand Terrace — most perennials thrive, and annual vegetables can go out early and stay late.
The average first fall frost in Grand Terrace is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
RIVERSIDE CITRUS EXP · 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 Grand Terrace’s own odds, recorded at RIVERSIDE CITRUS EXP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 12 | Feb 11 | Jan 1 | Nov 25 | Dec 13 | Jan 8 |
| 32°F | Feb 17 | Jan 10 | Dec 20 | Dec 11 | Jan 2 | Feb 7 |
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 Grand Terrace, 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.
Grand Terrace planting FAQ
When is the last spring frost in Grand Terrace, CA?
Grand Terrace's average last spring frost falls near January 10 — 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 Grand Terrace, CA?
In Grand Terrace, the first 32°F freeze of fall lands around January 2 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Grand Terrace in?
Grand Terrace is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Grand Terrace?
Grand Terrace has about -8 frost-free days — a short growing season — between the average last spring frost (January 10) and first fall frost (January 2).
When should I plant tomatoes in Grand Terrace?
For Grand Terrace, sow tomatoes indoors about November 15–November 29 and move the seedlings out around January 17, after the last spring frost.
Never miss a window in Grand Terrace
An email when it’s time to start seeds, transplant, and sow — timed to Grand Terrace’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Colton · 3 km
- Loma Linda · 6 km
- Bloomington · 9 km
- Rialto · 12 km
- San Bernardino · 12 km
- Riverside · 13 km
- Redlands · 13 km
- Muscoy · 14 km
Frost dates recorded at RIVERSIDE CITRUS EXP, 8 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 Grand Terrace, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00047473. Retrieved from https://blissgarden.com/california/grand-terrace.