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

Planting zone for 95595 — Zenia, CA

ZIP code 95595 (Zenia, Trinity County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is April 23 and the first fall frost October 19.

Where ZIP 95595 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostApr 23

First frostOct 19

2012 zone9a

Was 9a on the 2012 map — half a zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Zenia, 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 Zenia, CA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 23median — 50% chance of a later frost

Safe for tender plantsMay 11only 10% chance of frost after

First fall frostOctober 19median — 10% chance by Oct 2

Growing season179 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 29 and returns around November 3.

From the NOAA station Covelo, CA — 19 miles away, elevation 1,414 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 95595

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 12 – Mar 26

SpinachSow outdoors · Mar 12 – Apr 2

Broccoli, cabbageStart indoors · Feb 12 – Feb 26

Broccoli, cabbageTransplant · Apr 2 – Apr 16

Onion setsPlant outdoors · Mar 26 – Apr 9

PotatoesPlant outdoors · Apr 2 – Apr 16

LettuceSow outdoors · Mar 26 – Apr 9

Carrots, beetsSow outdoors · Apr 2 – Apr 16

TomatoesStart indoors · Feb 26 – Mar 12

TomatoesTransplant · Apr 30 – May 14

Peppers, eggplantStart indoors · Feb 12 – Feb 26

Peppers, eggplantTransplant · May 7 – May 21

BeansSow outdoors · Apr 30 – May 14

Sweet cornSow outdoors · Apr 30 – May 14

Cucumbers, squashSow outdoors · Apr 30 – May 14

Fall lettuce, spinachSow outdoors · Aug 24 – Sep 7

GarlicPlant cloves · Oct 5 – Nov 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 19) 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 95595 came on Feb 14 — 23 days earlier than the 1991–2020 average (Mar 9).

average
Mar 92026
Feb 14

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 Zenia, CA

The soil mapped at the center of ZIP 95595 is Yollabolly — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer

pH4.5strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter75%high

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Yollabolly very rocky loam, 30 to 65 percent slopes, low ffd.

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 95595; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Zenia, CA

Summer high92 °Faverage high, July

Winter low32 °Faverage low, December

Hot days74days a year at 90 °F or more

Freezing nights77nights a year at 32 °F or less

Growing degree days3,078base 50 °F — the season’s usable heat

Longest day15 h 01 mindaylight on June 21

Shortest day9 h 19 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation40.4 inper year, rain and melted snow

Snowfall3 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Covelo, CA (19 mi away); precipitation: Covelo, CA (19 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

954289a

Covelo, CA · 18 mi

955528b

Mad River, CA · 23 mi

955119a

Alderpoint, CA · 23 mi

Laytonville, CA · 28 mi

960418b

Hayfork, CA · 30 mi

955149a

Blocksburg, CA · 30 mi

California planting zones →

Questions about 95595

What planting zone is ZIP code 95595?

ZIP code 95595 (Zenia, CA) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Zenia, CA?

The median last spring frost (32 °F) near 95595 is April 23; after May 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Covelo station.

When is the first frost in Zenia, CA?

The median first fall frost near 95595 is October 19, giving a median frost-free growing season of 179 days.

When should I plant tomatoes in 95595?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 95595 get?

About 40.4 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Covelo station).

How hot do summers get in Zenia, CA?

The average high peaks at 92 °F in July, with about 74 days a year at 90 °F or more.

What kind of soil does 95595 have?

The USDA soil survey maps Yollabolly at the center of ZIP 95595: slightly decomposed plant material, well drained, pH about 4.5 (strongly acidic).

Did spring come early in Zenia, CA in 2026?

Spring leaf-out near 95595 came on Feb 14 in 2026, 23 days earlier than the 1991–2020 average (Mar 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Zenia, CA?

Long-day onions: the longest day near 95595 is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 95595 change?

Yes. The 2012 USDA map put 95595 in zone 9a; the 2023 map puts it in zone 8b. The newer map uses 1991–2020 data and more weather stations.