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Will it freeze in Martinez in the next 7 nights?
No overnight lows at or below 32°F are forecast in Martinez during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 49°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 49°F Above 36°F · Mostly Clear
- Fri, Nov 6 48°F Above 36°F · Mostly Clear
- Sat, Nov 7 50°F Above 36°F · Mostly Clear
- Sun, Nov 8 51°F Above 36°F · Partly Cloudy
- Mon, Nov 9 51°F Above 36°F · Mostly Clear
- Tue, Nov 10 52°F Above 36°F · Partly Cloudy then Slight Chance Light Rain
- Wed, Nov 11 52°F Above 36°F · Chance Light Rain
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Martinez
The median first fall hard-freeze date (28°F) is December 9, from NOAA’s 1991–2020 Climate Normals at Martinez Water Treatment Plant. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Mar 15 · Apr 10 · May 3 | Oct 27 · Nov 7 · Nov 21 | 210 days |
| 32°F freeze | Jan 29 · Feb 28 · Apr 5 | Nov 7 · Nov 22 · Dec 10 | 266 days |
| 28°F hard freeze | Dec 25 · Jan 23 · Feb 25 | Nov 20 · Dec 9 · Jan 6 | 323 days |
Average high temperature by month
1991–2020 normals at Martinez Water Treatment Plant
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Martinez, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Martinez Water Treatment Plant (station USC00045378, elevation 40 ft), 1.1 mi from Martinez. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Martinez
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Pleasant Hill, CA | 3.7 mi | Jan 7 | Dec 19 |
| Benicia, CA | 5.6 mi | Jan 17 | Dec 27 |
| Concord, CA | 6.2 mi | Jan 9 | Dec 14 |
| Lafayette, CA | 7.5 mi | Jan 7 | Dec 19 |
| Walnut Creek, CA | 7.5 mi | Jan 7 | Dec 19 |
| Orinda, CA | 8.7 mi | rare | rare |
| Hercules, CA | 9.9 mi | Jan 17 | Dec 27 |
| Moraga, CA | 11 mi | rare | rare |
| Clayton, CA | 11 mi | Mar 8 | Dec 22 |
| Vallejo, CA | 11 mi | Jan 17 | Dec 27 |
Frequently asked questions
When is the last frost in Martinez?
On average, the last spring frost (32°F) in Martinez is around February 28. In about 1 year in 10 it comes after April 5, and in 9 years in 10 it comes after January 29.
When is the first frost in Martinez?
The first fall frost (32°F) usually arrives around November 22. There’s a 10% chance of a freeze by November 7 and a 90% chance by December 10.
Can it frost in Martinez after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after April 10.
What growing zone is Martinez?
Martinez is in USDA Plant Hardiness Zone 9b (average annual extreme minimum temperature 25 to 30°F), based on the 2023 USDA map for ZIP code 94553. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in Martinez · frost vs. freeze