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

Planting zone for 93003 — Ventura, CA

ZIP code 93003 (Ventura, Ventura County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 93003 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 Ventura, 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 — 9 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 93003 came on Jan 16 — 6 days earlier than the 1991–2020 average (Jan 22).

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 Ventura, CA

The soil mapped at the center of ZIP 93003 is Sorrento — loam, well drained.

TextureLoama good balance for most vegetables
pH7.3neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Sorrento loam, 2 to 9 percent slopes, warm MAAT, MLRA 19.

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 93003; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ventura, CA

Summer high74 °Faverage high, August
Winter low46 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights0nights a year at 32 °F or less
Growing degree days4,122base 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

40°50°60°70°80°January: average high 66 °F, low 46 °F 66°46° JanFebruary: average high 65 °F, low 48 °F 65°48° FebMarch: average high 66 °F, low 49 °F 66°49° MarApril: average high 67 °F, low 51 °F 67°51° AprMay: average high 68 °F, low 54 °F 68°54° MayJune: average high 70 °F, low 58 °F 70°58° JunJuly: average high 73 °F, low 61 °F 73°61° JulAugust: average high 74 °F, low 61 °F 74°61° AugSeptember: average high 74 °F, low 60 °F 74°60° SepOctober: average high 74 °F, low 55 °F 74°55° OctNovember: average high 70 °F, low 50 °F 70°50° NovDecember: average high 66 °F, low 47 °F 66°47° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.59 in precipitation 3.6 JanFebruary: 3.81 in precipitation 3.8 FebMarch: 2.81 in precipitation 2.8 MarApril: 0.92 in precipitation 0.9 AprMay: 0.27 in precipitation 0.3 MayJune: 0.04 in precipitation 0.0 JunJuly: 0.09 in precipitation 0.1 JulAugust: 0.01 in precipitation 0.0 AugSeptember: 0.07 in precipitation 0.1 SepOctober: 0.73 in precipitation 0.7 OctNovember: 1.09 in precipitation 1.1 NovDecember: 2.63 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Oxnard Ventura Co. Airport, CA (6 mi away); precipitation: Ventura, CA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

2 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

9300410a
Ventura, CA · 3 mi
9300210a
Ventura, CA · 4 mi
9300510a
Ventura, CA · 4 mi
9300610a
Ventura, CA · 4 mi
9300710a
Ventura, CA · 4 mi
9303610a
Oxnard, CA · 5 mi
9303010b
Oxnard, CA · 6 mi
9303210b
Oxnard, CA · 7 mi

All 8 ZIP codes in Ventura → · California planting zones →

Questions about 93003

What planting zone is ZIP code 93003?

ZIP code 93003 (Ventura, 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 93003 get?

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

How hot do summers get in Ventura, CA?

The average high peaks at 74 °F in August, with about 2 days a year at 90 °F or more.

What kind of soil does 93003 have?

The USDA soil survey maps Sorrento at the center of ZIP 93003: loam, well drained, pH about 7.3 (neutral).

Did spring come early in Ventura, CA in 2026?

Spring leaf-out near 93003 came on Jan 16 in 2026, 6 days earlier than the 1991–2020 average (Jan 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ventura, CA?

Intermediate onions: the longest day near 93003 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.