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

Planting zone for 95450 — Jenner, CA

ZIP code 95450 (Jenner, Sonoma County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F. The median last spring frost is February 26 and the first fall frost December 27.

Where ZIP 95450 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 frostFeb 26
First frostDec 27
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 Jenner, 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 Jenner, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 26median — 50% chance of a later frost
Safe for tender plantsMay 1only 10% chance of frost after
First fall frostDecember 27median — 10% chance by Dec 1
Growing season310 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 29 and returns around January 16.

From the NOAA station Ft Ross, CA — 2 miles away, elevation 112 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 95450

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 15 – Jan 29
SpinachSow outdoors · Jan 15 – Feb 5
Broccoli, cabbageStart indoors · Dec 18 – Jan 1
Broccoli, cabbageTransplant · Feb 5 – Feb 19
Onion setsPlant outdoors · Jan 29 – Feb 12
PotatoesPlant outdoors · Feb 5 – Feb 19
LettuceSow outdoors · Jan 29 – Feb 12
Carrots, beetsSow outdoors · Feb 5 – Feb 19
TomatoesStart indoors · Jan 1 – Jan 15
TomatoesTransplant · Mar 5 – Mar 19
Peppers, eggplantStart indoors · Dec 18 – Jan 1
Peppers, eggplantTransplant · Mar 12 – Mar 26
BeansSow outdoors · Mar 5 – Mar 19
Sweet cornSow outdoors · Mar 5 – Mar 19
Cucumbers, squashSow outdoors · Mar 5 – Mar 19
Fall lettuce, spinachSow outdoors · Nov 1 – Nov 15
GarlicPlant cloves · Dec 13 – Jan 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 26) and first fall frost (Dec 27) 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 95450 came on Jan 23 — 6 days earlier than the 1991–2020 average (Jan 29).

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 Jenner, CA

The soil mapped at the center of ZIP 95450 is Hugo — very gravelly loam, well drained.

TextureVery gravelly loama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Hugo very gravelly loam, 50 to 75 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 95450; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jenner, CA

Summer high67 °Faverage high, August
Winter low42 °Faverage low, January
Hot days0days a year at 90 °F or more
Freezing nights12nights a year at 32 °F or less
Growing degree days1,555base 50 °F — the season’s usable heat
Longest day14 h 51 mindaylight on June 21
Shortest day9 h 28 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation64.2 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°32 °FJanuary: average high 57 °F, low 42 °F 57°42° JanFebruary: average high 59 °F, low 42 °F 59°42° FebMarch: average high 59 °F, low 42 °F 59°42° MarApril: average high 60 °F, low 43 °F 60°43° AprMay: average high 62 °F, low 45 °F 62°45° MayJune: average high 66 °F, low 46 °F 66°46° JunJuly: average high 66 °F, low 48 °F 66°48° JulAugust: average high 67 °F, low 50 °F 67°50° AugSeptember: average high 67 °F, low 48 °F 67°48° SepOctober: average high 66 °F, low 47 °F 66°47° OctNovember: average high 61 °F, low 44 °F 61°44° NovDecember: average high 57 °F, low 42 °F 57°42° Dec

Precipitation by month inches

0″2″4″6″8″10″12″January: 11.63 in precipitation 11.6 JanFebruary: 11.89 in precipitation 11.9 FebMarch: 9.95 in precipitation 9.9 MarApril: 3.50 in precipitation 3.5 AprMay: 3.63 in precipitation 3.6 MayJune: 0.68 in precipitation 0.7 JunJuly: 0.03 in precipitation 0.0 JulAugust: 0.06 in precipitation 0.1 AugSeptember: 0.42 in precipitation 0.4 SepOctober: 3.16 in precipitation 3.2 OctNovember: 7.06 in precipitation 7.1 NovDecember: 12.14 in precipitation 12.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ft Ross, CA (2 mi away); precipitation: Cazadero 5.6 W, CA (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

954219b
Cazadero, CA · 5 mi
954309b
Duncans Mills, CA · 9 mi
954869b
Villa Grande, CA · 10 mi
954629b
Monte Rio, CA · 10 mi
954469b
Guerneville, CA · 11 mi
9546510a
Occidental, CA · 11 mi
954719b
Rio Nido, CA · 13 mi
954199b
Camp Meeker, CA · 15 mi

California planting zones →

Questions about 95450

What planting zone is ZIP code 95450?

ZIP code 95450 (Jenner, 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 Jenner, CA?

The median last spring frost (32 °F) near 95450 is February 26; after May 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ft Ross station.

When is the first frost in Jenner, CA?

The median first fall frost near 95450 is December 27, giving a median frost-free growing season of 310 days.

When should I plant tomatoes in 95450?

Start tomato seeds indoors around Jan 1 – Jan 15 and set transplants outside around Mar 5 – Mar 19, one to three weeks after the median last frost.

How much rain and snow does 95450 get?

About 64.2 inches of precipitation a year (NOAA 1991–2020 normals, Cazadero 5.6 W station).

How hot do summers get in Jenner, CA?

The average high peaks at 67 °F in August, with about 0 days a year at 90 °F or more.

What kind of soil does 95450 have?

The USDA soil survey maps Hugo at the center of ZIP 95450: very gravelly loam, well drained, pH about 6.5 (neutral).

Did spring come early in Jenner, CA in 2026?

Spring leaf-out near 95450 came on Jan 23 in 2026, 6 days earlier than the 1991–2020 average (Jan 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Jenner, CA?

Intermediate onions: the longest day near 95450 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.