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Will it freeze in Simi Valley in the next 7 nights?
No overnight lows at or below 32°F are forecast in Simi Valley during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 58°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 58°F Above 36°F · Mostly Clear
- Fri, Nov 6 60°F Above 36°F · Clear
- Sat, Nov 7 59°F Above 36°F · Clear
- Sun, Nov 8 59°F Above 36°F · Mostly Clear
- Mon, Nov 9 59°F Above 36°F · Partly Cloudy
- Tue, Nov 10 58°F Above 36°F · Mostly Clear
- Wed, Nov 11 57°F Above 36°F · Mostly Clear then Slight 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 Simi Valley
Most years have no 28°F hard freeze at Woodland Hills Pierce College, 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 30 · Mar 2 · Apr 7 | Nov 12 · Nov 29 · Dec 19 | 271 days |
| 32°F freeze | Dec 21 · Jan 24 · Mar 5 | Nov 27 · Dec 15 · Jan 26 | 329 days |
| 28°F hard freeze | Dec 5 · Dec 31 · Feb 1 | Dec 1 · Dec 26 · Jan 25 | 365 days |
Average high temperature by month
1991–2020 normals at Woodland Hills Pierce College
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 Simi Valley, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Woodland Hills Pierce College (station USC00049785, elevation 790 ft), 12 mi from Simi Valley. 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 Simi Valley
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Moorpark, CA | 7.5 mi | rare | rare |
| Agoura Hills, CA | 8.1 mi | Jan 24 | Dec 15 |
| Thousand Oaks, CA | 8.7 mi | rare | rare |
| Westlake Village, CA | 9.9 mi | Jan 24 | Dec 15 |
| Calabasas, CA | 11 mi | Jan 24 | Dec 15 |
| Fillmore, CA | 13 mi | rare | rare |
| Camarillo, CA | 17 mi | rare | rare |
| Malibu, CA | 17 mi | Jan 24 | Dec 15 |
| Santa Clarita, CA | 17 mi | rare | rare |
| San Fernando, CA | 18 mi | rare | rare |
Frequently asked questions
When is the last frost in Simi Valley?
On average, the last spring frost (32°F) in Simi Valley is around January 24. In about 1 year in 10 it comes after March 5, and in 9 years in 10 it comes after December 21.
When is the first frost in Simi Valley?
The first fall frost (32°F) usually arrives around December 15. There’s a 10% chance of a freeze by November 27 and a 90% chance by January 26.
Can it frost in Simi Valley 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 March 2.
What growing zone is Simi Valley?
Simi Valley is in USDA Plant Hardiness Zone 10a (average annual extreme minimum temperature 30 to 35°F), based on the 2023 USDA map for ZIP code 93065. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in Simi Valley · frost vs. freeze