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

Planting zone for 95321 — Groveland, CA

ZIP code 95321 (Groveland, Tuolumne County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 16 and the first fall frost November 12.

Where ZIP 95321 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 16
First frostNov 12
2012 zone9a

Was 9a on the 2012 map — 3 zones colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Groveland, 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 Groveland, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 12only 10% chance of frost after
First fall frostNovember 12median — 10% chance by Oct 24
Growing season208 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 25 and returns around November 28.

From the NOAA station Hetch Hetchy, CA — 4 miles away, elevation 3,872 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 95321

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Sep 17 – Oct 1
GarlicPlant cloves · Oct 29 – Dec 3
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Nov 12) 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 95321 came on Feb 4 — 21 days earlier than the 1991–2020 average (Feb 25).

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 Groveland, CA

The soil mapped at the center of ZIP 95321 is Typic Dystroxerepts — slightly decomposed plant material, somewhat excessively drained.

TextureSlightly decomposed plant materialtop layer
DrainageSomewhat excessively drainednatural drainage class
Organic matter80%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Typic Dystroxerepts-Humic Dystroxerepts-Rock outcrop association, 15 to 45 percent slopes, mountain slopes, frigid.

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 95321; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Groveland, CA

Summer high86 °Faverage high, July
Winter low32 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights71nights a year at 32 °F or less
Growing degree days3,125base 50 °F — the season’s usable heat
Longest day14 h 48 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation35.3 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 48 °F, low 32 °F 48°32° JanFebruary: average high 52 °F, low 33 °F 52°33° FebMarch: average high 57 °F, low 36 °F 57°36° MarApril: average high 62 °F, low 39 °F 62°39° AprMay: average high 69 °F, low 46 °F 69°46° MayJune: average high 78 °F, low 53 °F 78°53° JunJuly: average high 86 °F, low 59 °F 86°59° JulAugust: average high 86 °F, low 59 °F 86°59° AugSeptember: average high 81 °F, low 54 °F 81°54° SepOctober: average high 70 °F, low 45 °F 70°45° OctNovember: average high 57 °F, low 37 °F 57°37° NovDecember: average high 47 °F, low 33 °F 47°33° Dec

Precipitation by month inches

0″2″4″6″January: 6.37 in precipitation 6.4 JanFebruary: 5.91 in precipitation 5.9 FebMarch: 5.17 in precipitation 5.2 MarApril: 3.38 in precipitation 3.4 AprMay: 2.14 in precipitation 2.1 MayJune: 0.55 in precipitation 0.6 JunJuly: 0.29 in precipitation 0.3 JulAugust: 0.08 in precipitation 0.1 AugSeptember: 0.38 in precipitation 0.4 SepOctober: 2.22 in precipitation 2.2 OctNovember: 3.33 in precipitation 3.3 NovDecember: 5.48 in precipitation 5.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hetch Hetchy, CA (4 mi away); precipitation: Mather, CA (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

953188b
El Portal, CA · 18 mi
953358a
Long Barn, CA · 19 mi
953798b
Tuolumne, CA · 21 mi
953646b
Pinecrest, CA · 21 mi
953468b
Mi Wuk Village, CA · 21 mi
953118b
Coulterville, CA · 21 mi
953757b
Strawberry, CA · 21 mi
953838b
Twain Harte, CA · 24 mi

California planting zones →

Questions about 95321

What planting zone is ZIP code 95321?

ZIP code 95321 (Groveland, CA) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Groveland, CA?

The median last spring frost (32 °F) near 95321 is April 16; after May 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hetch Hetchy station.

When is the first frost in Groveland, CA?

The median first fall frost near 95321 is November 12, giving a median frost-free growing season of 208 days.

When should I plant tomatoes in 95321?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 95321 get?

About 35.3 inches of precipitation a year (NOAA 1991–2020 normals, Mather station).

How hot do summers get in Groveland, CA?

The average high peaks at 86 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 95321 have?

The USDA soil survey maps Typic Dystroxerepts at the center of ZIP 95321: slightly decomposed plant material, somewhat excessively drained.

Did spring come early in Groveland, CA in 2026?

Spring leaf-out near 95321 came on Feb 4 in 2026, 21 days earlier than the 1991–2020 average (Feb 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Groveland, CA?

Intermediate onions: the longest day near 95321 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 95321 change?

Yes. The 2012 USDA map put 95321 in zone 9a; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.