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

Planting zone for 93009 — Ventura, CA

ZIP code 93009 (Ventura, Ventura County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F. The median last spring frost is March 21 and the first fall frost November 15.

Where ZIP 93009 is

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 frostMar 21
First frostNov 15
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 in Ventura, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 21median — 50% chance of a later frost
Safe for tender plantsApril 15only 10% chance of frost after
First fall frostNovember 15median — 10% chance by Oct 28
Growing season235 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 17 and returns around December 1.

From the NOAA station Ojai, CA — 8 miles away, elevation 745 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 93009

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 7 – Feb 21
SpinachSow outdoors · Feb 7 – Feb 28
Broccoli, cabbageStart indoors · Jan 10 – Jan 24
Broccoli, cabbageTransplant · Feb 28 – Mar 14
Onion setsPlant outdoors · Feb 21 – Mar 7
PotatoesPlant outdoors · Feb 28 – Mar 14
LettuceSow outdoors · Feb 21 – Mar 7
Carrots, beetsSow outdoors · Feb 28 – Mar 14
TomatoesStart indoors · Jan 24 – Feb 7
TomatoesTransplant · Mar 28 – Apr 11
Peppers, eggplantStart indoors · Jan 10 – Jan 24
Peppers, eggplantTransplant · Apr 4 – Apr 18
BeansSow outdoors · Mar 28 – Apr 11
Sweet cornSow outdoors · Mar 28 – Apr 11
Cucumbers, squashSow outdoors · Mar 28 – Apr 11
Fall lettuce, spinachSow outdoors · Sep 20 – Oct 4
GarlicPlant cloves · Nov 1 – Dec 6
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 21) and first fall frost (Nov 15) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 93009 came on Jan 17 — 6 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 Ventura, CA

The center of ZIP 93009 is mapped as Riverwash: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 93009; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Ventura, CA

Summer high91 °Faverage high, August
Winter low33 °Faverage low, December
Hot days75days a year at 90 °F or more
Freezing nights31nights a year at 32 °F or less
Growing degree days3,958base 50 °F — the season’s usable heat
Longest day14 h 27 mindaylight on June 21
Shortest day9 h 51 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation20.7 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 66 °F, low 35 °F 66°35° JanFebruary: average high 67 °F, low 36 °F 67°36° FebMarch: average high 70 °F, low 39 °F 70°39° MarApril: average high 74 °F, low 41 °F 74°41° AprMay: average high 77 °F, low 46 °F 77°46° MayJune: average high 82 °F, low 50 °F 82°50° JunJuly: average high 89 °F, low 54 °F 89°54° JulAugust: average high 91 °F, low 54 °F 91°54° AugSeptember: average high 88 °F, low 51 °F 88°51° SepOctober: average high 81 °F, low 45 °F 81°45° OctNovember: average high 73 °F, low 37 °F 73°37° NovDecember: average high 65 °F, low 33 °F 65°33° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 5.09 in precipitation 5.1 JanFebruary: 5.24 in precipitation 5.2 FebMarch: 3.41 in precipitation, 0.1 in snowfall 3.4 MarApril: 1.08 in precipitation 1.1 AprMay: 0.54 in precipitation 0.5 MayJune: 0.11 in precipitation 0.1 JunJuly: 0.07 in precipitation 0.1 JulAugust: 0.00 in precipitation 0.0 AugSeptember: 0.10 in precipitation 0.1 SepOctober: 0.84 in precipitation 0.8 OctNovember: 1.32 in precipitation 1.3 NovDecember: 2.88 in precipitation 2.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ojai, CA (8 mi away); precipitation: Ojai, CA (8 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.

9306010a
Santa Paula, CA · 3 mi
9306110a
Santa Paula, CA · 5 mi
9300410a
Ventura, CA · 5 mi
9300310a
Ventura, CA · 7 mi
9303610a
Oxnard, CA · 7 mi
930249b
Ojai, CA · 8 mi
9306610a
Somis, CA · 9 mi
930229b
Oak View, CA · 9 mi

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

Questions about 93009

What planting zone is ZIP code 93009?

ZIP code 93009 (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).

When is the last frost in Ventura, CA?

The median last spring frost (32 °F) near 93009 is March 21; after April 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ojai station.

When is the first frost in Ventura, CA?

The median first fall frost near 93009 is November 15, giving a median frost-free growing season of 235 days.

When should I plant tomatoes in 93009?

Start tomato seeds indoors around Jan 24 – Feb 7 and set transplants outside around Mar 28 – Apr 11, one to three weeks after the median last frost.

How much rain and snow does 93009 get?

About 20.7 inches of precipitation a year (NOAA 1991–2020 normals, Ojai station).

How hot do summers get in Ventura, CA?

The average high peaks at 91 °F in August, with about 75 days a year at 90 °F or more.

Did spring come early in Ventura, CA in 2026?

Spring leaf-out near 93009 came on Jan 17 in 2026, 6 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Ventura, CA?

Intermediate onions: the longest day near 93009 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.