Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for Manteca, CA

Manteca, CA is in USDA zone 9b across its 2 ZIP codes. The median last spring frost is February 6 and the first fall frost December 1.

Manteca on the zone map

Outlined: its 2 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 frostFeb 6

First frostDec 1

Growing season304 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 Manteca, CA

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostFebruary 6median — 50% chance of a later frost

Safe for tender plantsFebruary 28only 10% chance of frost after

First fall frostDecember 1median — 10% chance by Nov 15

Growing season304 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 10 and returns around December 16.

From the NOAA station Stockton Metro Airport, CA, elevation 26 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 Manteca

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Dec 26 – Jan 9

SpinachSow outdoors · Dec 26 – Jan 16

Broccoli, cabbageStart indoors · Nov 28 – Dec 12

Broccoli, cabbageTransplant · Jan 16 – Jan 30

Onion setsPlant outdoors · Jan 9 – Jan 23

PotatoesPlant outdoors · Jan 16 – Jan 30

LettuceSow outdoors · Jan 9 – Jan 23

Carrots, beetsSow outdoors · Jan 16 – Jan 30

TomatoesStart indoors · Dec 12 – Dec 26

TomatoesTransplant · Feb 13 – Feb 27

Peppers, eggplantStart indoors · Nov 28 – Dec 12

Peppers, eggplantTransplant · Feb 20 – Mar 6

BeansSow outdoors · Feb 13 – Feb 27

Sweet cornSow outdoors · Feb 13 – Feb 27

Cucumbers, squashSow outdoors · Feb 13 – Feb 27

Fall lettuce, spinachSow outdoors · Oct 6 – Oct 20

GarlicPlant cloves · Nov 17 – Dec 22

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 6) and first fall frost (Dec 1) 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 95336 came on Jan 30 — about the same time as the 1991–2020 average (Feb 1).

average
Feb 12026
Jan 30

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 Manteca, CA

The soil mapped at the center of ZIP 95336 is Tinnin — loamy coarse sand, well drained.

TextureLoamy coarse sanddrains and warms fast; dries out and needs more feeding

pH7.0neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupAwater soaks in fast

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Tinnin loamy coarse sand, 0 to 2 percent slopes.

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 95336; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Manteca, CA

Summer high95 °Faverage high, July

Winter low38 °Faverage low, December

Hot days88days a year at 90 °F or more

Freezing nights19nights a year at 32 °F or less

Growing degree days5,040base 50 °F — the season’s usable heat

Longest day14 h 47 mindaylight on June 21

Shortest day9 h 33 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation13.4 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

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

ZIP codes in Manteca

California planting zones →

Questions about Manteca

What planting zone is Manteca, CA?

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

When is the last frost in Manteca, CA?

The median last spring frost is February 6 and the median first fall frost is December 1 (NOAA 1991–2020 normals, Stockton Metro Airport station).

When can I plant a garden in Manteca, CA?

Cool-season crops like peas and spinach go in around Dec 26 – Jan 16; tomatoes, peppers, beans and squash after about Feb 13, once frost risk has passed.

What kind of onions grow in Manteca, CA?

Intermediate onions: the longest day is 14 h 47 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Manteca, CA get?

About 13.4 inches of precipitation a year (NOAA 1991–2020 normals).