Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 93066 — Somis, CA

ZIP code 93066 (Somis, Ventura County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 93066 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone10a30 to 35 °F
Coldest night−1.1 to 1.7 °C
Last frostrare
First frostrare
2012 zone10a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 10a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Somis, CA…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Camarillo Airport, CA — 7 miles away, elevation 79 ft) the median growing season is 365 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 93066 came on Jan 16 — 7 days earlier than the 1991–2020 average (Jan 23).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Somis, CA

The soil mapped at the center of ZIP 93066 is San Benito — clay loam, well drained.

TextureClay loamholds water and nutrients; slow to drain and warm up
pH8.0alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: San Benito clay loam, 30 to 50 percent slopes, eroded, MLRA 20.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 93066; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Somis, CA

Summer high80 °Faverage high, August
Winter low44 °Faverage low, December
Hot days9days a year at 90 °F or more
Freezing nights1nights a year at 32 °F or less
Growing degree days4,589base 50 °F — the season’s usable heat
Longest day14 h 27 mindaylight on June 21
Shortest day9 h 52 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation16.1 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°32 °FJanuary: average high 68 °F, low 45 °F 68°45° JanFebruary: average high 68 °F, low 46 °F 68°46° FebMarch: average high 69 °F, low 47 °F 69°47° MarApril: average high 71 °F, low 49 °F 71°49° AprMay: average high 72 °F, low 53 °F 72°53° MayJune: average high 75 °F, low 57 °F 75°57° JunJuly: average high 78 °F, low 60 °F 78°60° JulAugust: average high 80 °F, low 61 °F 80°61° AugSeptember: average high 80 °F, low 59 °F 80°59° SepOctober: average high 76 °F, low 54 °F 76°54° OctNovember: average high 73 °F, low 49 °F 73°49° NovDecember: average high 68 °F, low 44 °F 68°44° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.55 in precipitation 3.5 JanFebruary: 3.91 in precipitation 3.9 FebMarch: 3.12 in precipitation 3.1 MarApril: 0.72 in precipitation 0.7 AprMay: 0.36 in precipitation 0.4 MayJune: 0.08 in precipitation 0.1 JunJuly: 0.05 in precipitation 0.1 JulAugust: 0.01 in precipitation 0.0 AugSeptember: 0.09 in precipitation 0.1 SepOctober: 0.61 in precipitation 0.6 OctNovember: 1.02 in precipitation 1.0 NovDecember: 2.59 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Camarillo Airport, CA (7 mi away); precipitation: Camarillo 0.6 N, CA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 10a.

9306110a
Santa Paula, CA · 5 mi
9301110a
Camarillo, CA · 6 mi
9301010a
Camarillo, CA · 6 mi
9301210a
Camarillo, CA · 7 mi
9306010a
Santa Paula, CA · 7 mi
9302110a
Moorpark, CA · 7 mi
9302010a
Moorpark, CA · 8 mi
9300910a
Ventura, CA · 9 mi

California planting zones →

Questions about 93066

What planting zone is ZIP code 93066?

ZIP code 93066 (Somis, CA) is in USDA hardiness zone 10a on the 2023 map: the coldest night of an average winter reaches 30 to 35 °F (−1.1 to 1.7 °C).

How much rain and snow does 93066 get?

About 16.1 inches of precipitation a year (NOAA 1991–2020 normals, Camarillo 0.6 N station).

How hot do summers get in Somis, CA?

The average high peaks at 80 °F in August, with about 9 days a year at 90 °F or more.

What kind of soil does 93066 have?

The USDA soil survey maps San Benito at the center of ZIP 93066: clay loam, well drained, pH about 8.0 (alkaline).

Did spring come early in Somis, CA in 2026?

Spring leaf-out near 93066 came on Jan 16 in 2026, 7 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Somis, CA?

Intermediate onions: the longest day near 93066 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.