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

Planting zone for Watsonville, CA

Watsonville, CA is in USDA zone 9b across its 2 ZIP codes. The median last spring frost is January 28 and the first fall frost December 13.

Watsonville on the zone map

Outlined: its 1 ZIP code areas · 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.

Zone9b25 to 30 °F
ZIP codes2
Last frostJan 28
First frostDec 13
Growing season324 days

9b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Watsonville, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJanuary 28median — 50% chance of a later frost
Safe for tender plantsMarch 3only 10% chance of frost after
First fall frostDecember 13median — 10% chance by Nov 25
Growing season324 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 2 and returns around December 26.

From the NOAA station Watsonville Wtr Wks, CA, elevation 95 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 Watsonville

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Dec 17 – Dec 31
SpinachSow outdoors · Dec 17 – Jan 7
Broccoli, cabbageStart indoors · Nov 19 – Dec 3
Broccoli, cabbageTransplant · Jan 7 – Jan 21
Onion setsPlant outdoors · Dec 31 – Jan 14
PotatoesPlant outdoors · Jan 7 – Jan 21
LettuceSow outdoors · Dec 31 – Jan 14
Carrots, beetsSow outdoors · Jan 7 – Jan 21
TomatoesStart indoors · Dec 3 – Dec 17
TomatoesTransplant · Feb 4 – Feb 18
Peppers, eggplantStart indoors · Nov 19 – Dec 3
Peppers, eggplantTransplant · Feb 11 – Feb 25
BeansSow outdoors · Feb 4 – Feb 18
Sweet cornSow outdoors · Feb 4 – Feb 18
Cucumbers, squashSow outdoors · Feb 4 – Feb 18
Fall lettuce, spinachSow outdoors · Oct 18 – Nov 1
GarlicPlant cloves · Nov 29 – Jan 3
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jan 28) and first fall frost (Dec 13) 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 95076 came on Jan 23 — 4 days earlier than the 1991–2020 average (Jan 27).

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 Watsonville, CA

The soil mapped at the center of ZIP 95076 is Conejo — loam, well drained.

TextureLoama good balance for most vegetables
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Conejo loam, 0 to 2 percent slopes, cool, MLRA 14.

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 95076; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Watsonville, CA

Summer high74 °Faverage high, September
Winter low39 °Faverage low, December
Hot days7days a year at 90 °F or more
Freezing nights8nights a year at 32 °F or less
Growing degree days2,937base 50 °F — the season’s usable heat
Longest day14 h 42 mindaylight on June 21
Shortest day9 h 37 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation22.7 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°32 °FJanuary: average high 62 °F, low 40 °F 62°40° JanFebruary: average high 63 °F, low 42 °F 63°42° FebMarch: average high 65 °F, low 43 °F 65°43° MarApril: average high 68 °F, low 45 °F 68°45° AprMay: average high 69 °F, low 49 °F 69°49° MayJune: average high 71 °F, low 52 °F 71°52° JunJuly: average high 71 °F, low 54 °F 71°54° JulAugust: average high 72 °F, low 55 °F 72°55° AugSeptember: average high 74 °F, low 53 °F 74°53° SepOctober: average high 74 °F, low 49 °F 74°49° OctNovember: average high 68 °F, low 43 °F 68°43° NovDecember: average high 62 °F, low 39 °F 62°39° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.43 in precipitation 4.4 JanFebruary: 4.49 in precipitation 4.5 FebMarch: 3.59 in precipitation 3.6 MarApril: 1.62 in precipitation 1.6 AprMay: 0.58 in precipitation 0.6 MayJune: 0.14 in precipitation 0.1 JunJuly: 0.01 in precipitation 0.0 JulAugust: 0.03 in precipitation 0.0 AugSeptember: 0.06 in precipitation 0.1 SepOctober: 0.96 in precipitation 1.0 OctNovember: 2.25 in precipitation 2.3 NovDecember: 4.51 in precipitation 4.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Watsonville Wtr Wks, CA (within 1 mile); precipitation: Watsonville Wtr Wks, CA (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Watsonville

950769b
25 to 30 °F
950779b
25 to 30 °F

California planting zones →

Questions about Watsonville

What planting zone is Watsonville, CA?

Watsonville, CA is in USDA hardiness zone 9b on the 2023 map (9b: 25 to 30 °F).

When is the last frost in Watsonville, CA?

The median last spring frost is January 28 and the median first fall frost is December 13 (NOAA 1991–2020 normals, Watsonville Wtr Wks station).

When can I plant a garden in Watsonville, CA?

Cool-season crops like peas and spinach go in around Dec 17 – Jan 7; tomatoes, peppers, beans and squash after about Feb 4, once frost risk has passed.

What kind of onions grow in Watsonville, CA?

Intermediate onions: the longest day is 14 h 42 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Watsonville, CA get?

About 22.7 inches of precipitation a year (NOAA 1991–2020 normals).