When to plant in Chino Hills, CA
USDA Zone 10aEverything below — frost dates, hardiness zone, and what to plant when in Chino Hills, California — is derived from the closest NOAA station with complete climate normals.
With about 336 frost-free days, Chino Hills supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Zone 10a is warm enough that Chino Hills can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in Chino Hills is now 19 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CHINO 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 Chino Hills’s own odds, recorded at CHINO AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 29 | Feb 24 | Jan 21 | Nov 12 | Dec 1 | Dec 18 |
| 32°F | Feb 22 | Jan 17 | Dec 18 | Nov 27 | Dec 19 | Jan 17 |
| 28°F | Jan 28 | Jan 3 | Dec 11 | Dec 7 | Dec 30 | Jan 23 |
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 Chino Hills, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Chino Hills planting FAQ
When is the last spring frost in Chino Hills, CA?
On average, the last spring frost in Chino Hills is around January 17 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Chino Hills, CA?
Expect Chino Hills's first fall frost near December 19 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Chino Hills in?
Chino Hills is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Chino Hills?
There are roughly 336 frost-free days in Chino Hills (a long growing season), running from the average last frost around January 17 to the first fall frost near December 19.
When should I plant tomatoes in Chino Hills?
In Chino Hills, start tomato seeds indoors around November 22–December 6, then transplant seedlings outdoors around January 24 once the danger of frost has passed.
Never miss a window in Chino Hills
An email when it’s time to start seeds, transplant, and sow — timed to Chino Hills’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Chino · 6 km
- Yorba Linda · 7 km
- Anaheim · 10 km
- Diamond Bar · 11 km
- Brea · 13 km
- Pomona · 13 km
- Eastvale · 13 km
- Placentia · 14 km
Frost dates recorded at CHINO AP, 9 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 Chino Hills, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003179. Retrieved from https://blissgarden.com/california/chino-hills.