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Will it freeze in Walnut Creek in the next 7 nights?
No overnight lows at or below 32°F are forecast in Walnut Creek during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 47°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 47°F Above 36°F · Mostly Clear
- Fri, Nov 6 46°F Above 36°F · Mostly Clear
- Sat, Nov 7 48°F Above 36°F · Mostly Clear then Patchy Fog
- Sun, Nov 8 49°F Above 36°F · Partly Cloudy
- Mon, Nov 9 49°F Above 36°F · Mostly Clear
- Tue, Nov 10 50°F Above 36°F · Partly Cloudy then Slight Chance Light Rain
- Wed, Nov 11 49°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 Walnut Creek
Most years have no 28°F hard freeze at Concord Wastewater Plant, according to NOAA’s 1991–2020 Climate Normals. Check the short-term forecast above during cold snaps.
| 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 | Jan 6 · Feb 9 · Mar 6 | Nov 15 · Dec 2 · Dec 24 | 297 days |
| 32°F freeze | Dec 19 · Jan 7 · Feb 1 | Dec 1 · Dec 19 · Jan 12 | 346 days |
| 28°F hard freeze | Dec 14 · Dec 31 · Jan 20 | Dec 10 · Dec 29 · Jan 14 | 365 days |
Average high temperature by month
1991–2020 normals at Concord Wastewater 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 Walnut Creek, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Concord Wastewater Plant (station USC00041967, elevation 40 ft), 5.8 mi from Walnut Creek. 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 Walnut Creek
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Pleasant Hill, CA | 4.3 mi | Jan 7 | Dec 19 |
| Lafayette, CA | 4.3 mi | Jan 7 | Dec 19 |
| Concord, CA | 5.0 mi | Jan 9 | Dec 14 |
| Moraga, CA | 6.2 mi | rare | rare |
| Clayton, CA | 6.8 mi | Mar 8 | Dec 22 |
| Orinda, CA | 6.8 mi | rare | rare |
| Danville, CA | 7.5 mi | Mar 8 | Dec 22 |
| Martinez, CA | 7.5 mi | Feb 28 | Nov 22 |
| Pittsburg, CA | 11 mi | Jan 12 | Dec 19 |
| San Ramon, CA | 11 mi | Mar 8 | Dec 22 |
Frequently asked questions
When is the last frost in Walnut Creek?
On average, the last spring frost (32°F) in Walnut Creek is around January 7. In about 1 year in 10 it comes after February 1, and in 9 years in 10 it comes after December 19.
When is the first frost in Walnut Creek?
The first fall frost (32°F) usually arrives around December 19. There’s a 10% chance of a freeze by December 1 and a 90% chance by January 12.
Can it frost in Walnut Creek 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 February 9.
What growing zone is Walnut Creek?
Walnut Creek 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 94596. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in Walnut Creek · frost vs. freeze