Frost dates / California / Lancaster
Frost dates in Lancaster, CA
The station on this page is LANCASTER WM J FOX FLD, CA US (USW00003159), 3.9 miles from the city point. Population in the Census 2024 estimate is 167,426.
Zone 8aUSDA average annual extreme minimum 10°F to 15°F, from ZIP 93534 (2.1 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% | March 8 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 3 | Median. |
| 10% | April 23 | 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% | October 17 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 1 | Median. |
| 90% | November 14 | 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% | 240 |
| 50% | 211 |
| 90% | 185 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 7 | March 8 | February 14 |
| First, on or before | October 28 | November 10 | November 26 |
| Season at least | 274 days | 244 days | 212 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 5 | April 19 | March 31 |
| First, on or before | October 7 | October 22 | November 3 |
| Season at least | 210 days | 185 days | 163 days |
Station LANCASTER WM J FOX FLD, CA US (USW00003159). Completeness flag R, 27 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 712.6 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 Lancaster · Zone 8a
Check a crop against this station
Lancaster, CA
Zone 8aAverage annual extreme minimum 10°F to 15°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
California. Nearest qualified station: LANCASTER WM J FOX FLD, CA US (USW00003159), 3.9 miles. Median last 32°F April 3. Median first 32°F November 1. The 50% growing-season length is 211 days.
Open the ZIP page · Crop guides for California
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | April 23 | April 3 | March 8 |
| First 32°F on or before | October 17 | November 1 | November 14 |
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.
Date checks use your device’s calendar and appear after the page loads.