When to plant in Lake Arrowhead, CA
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Lake Arrowhead, California — all computed from Lake Arrowhead's nearest NOAA weather station.
In zone 8b, Lake Arrowhead supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
LAKE ARROWHEAD · 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 Lake Arrowhead’s own odds, recorded at LAKE ARROWHEAD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 10 | May 27 | May 3 | Sep 30 | Oct 18 | Nov 5 |
| 32°F | May 31 | May 5 | Apr 9 | Oct 12 | Nov 2 | Nov 15 |
| 28°F | May 12 | Apr 11 | Mar 14 | Oct 31 | Nov 16 | Nov 30 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Lake Arrowhead, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Lake Arrowhead planting FAQ
When is the last spring frost in Lake Arrowhead, CA?
Lake Arrowhead's average last spring frost falls near May 5 — 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 Lake Arrowhead, CA?
The first fall frost in Lake Arrowhead typically arrives around November 2 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Lake Arrowhead in?
Lake Arrowhead is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Lake Arrowhead?
Lake Arrowhead has about 181 frost-free days — a moderate growing season — between the average last spring frost (May 5) and first fall frost (November 2).
When should I plant tomatoes in Lake Arrowhead?
For Lake Arrowhead, sow tomatoes indoors about March 10–March 24 and move the seedlings out around May 12, after the last spring frost.
Never miss a window in Lake Arrowhead
An email when it’s time to start seeds, transplant, and sow — timed to Lake Arrowhead’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Highland · 16 km
- San Bernardino · 17 km
- Muscoy · 19 km
- Hesperia · 20 km
- Redlands · 22 km
- Loma Linda · 24 km
- Rialto · 25 km
- Colton · 26 km
Frost dates recorded at LAKE ARROWHEAD, 1 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 Lake Arrowhead, CA — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00044671. Retrieved from https://blissgarden.com/california/lake-arrowhead.