Frost dates / California / Los Banos
Frost dates in Los Banos, CA
The station on this page is LOS BANOS, CA US (USC00045118), 1.5 miles from the city point. Population in the Census 2024 estimate is 48,684.
Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 93635 (3.7 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 29 | Earlier date. A last 32°F on or after this day is common. |
| 50% | January 26 | Median. |
| 10% | February 20 | 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 26 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | December 10 | Median. |
| 90% | January 4 | 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% | 351 |
| 50% | 322 |
| 90% | 291 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | February 4 | January 6 | December 17 |
| First, on or before | December 6 | December 24 | January 19 |
| Season at least | 365 days | 356 days | 326 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 3 | February 24 | January 26 |
| First, on or before | November 12 | November 27 | December 11 |
| Season at least | 305 days | 273 days | 234 days |
Station LOS BANOS, CA US (USC00045118). Completeness flag S, 29 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 95.6%. Freeze dates are conditional on that threshold occurring. Elevation 36.6 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 Los Banos · Zone 9a
Check a crop against this station
Los Banos, CA
Zone 9aAverage annual extreme minimum 20°F to 25°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
California. Nearest qualified station: LOS BANOS, CA US (USC00045118), 1.5 miles. Median last 32°F January 26. Median first 32°F December 10. The 50% growing-season length is 322 days.
Open the ZIP page · Crop guides for California
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | February 20 | January 26 | December 29 |
| First 32°F on or before | November 26 | December 10 | January 4 |
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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