Frost dates / California / Campbell
Frost dates in Campbell, CA
The station on this page is LOS GATOS, CA US (USC00045123), 3.4 miles from the city point. Population in the Census 2024 estimate is 42,895.
Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 95008 (0.1 miles from the city point used on this page).
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | December 31 | Earlier date. A last 32°F on or after this day is common. |
| 50% | February 2 | Median. |
| 10% | March 14 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | November 16 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | December 6 | Median. |
| 90% | January 7 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 346 |
| 50% | 310 |
| 90% | 263 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | January 26 | January 1 | December 9 |
| First, on or before | November 28 | December 19 | January 13 |
| Season at least | 365 days | 356 days | 327 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 16 | March 20 | February 16 |
| First, on or before | November 4 | November 20 | December 5 |
| Season at least | 280 days | 241 days | 208 days |
Station LOS GATOS, CA US (USC00045123). Completeness flag R, 24 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 96.7%. Freeze dates are conditional on that threshold occurring. Elevation 111.3 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.
Planting calendar for Campbell · Zone 9b
Check a crop against this station
Campbell, CA
Zone 9bAverage annual extreme minimum 25°F to 30°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
California. Nearest qualified station: LOS GATOS, CA US (USC00045123), 3.4 miles. Median last 32°F February 2. Median first 32°F December 6. The 50% growing-season length is 310 days.
Open the ZIP page · Crop guides for California
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | March 14 | February 2 | December 31 |
| First 32°F on or before | November 16 | December 6 | January 7 |
Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.
Planting calendar
Windows below are from UC ANR, UC Master Gardener Program, Time of planting, retrieved 2026-10-10. North and North Coast = Monterey County north; South Coast = San Luis Obispo County south; Interior Valleys = Sacramento, San Joaquin, and similar valleys; Desert Valleys = Imperial and Coachella Valleys. Source line on the page: California Master Gardener Handbook, Table 13.2, Adapted from Vegetable Gardening Illustrated 1994.
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