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

Planting zone for 95470 — Redwood Valley, CA

ZIP code 95470 (Redwood Valley, Mendocino County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is April 8 and the first fall frost November 6.

Where ZIP 95470 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.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostApr 8
First frostNov 6
2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Redwood Valley, 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 Redwood Valley, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 8median — 50% chance of a later frost
Safe for tender plantsApril 29only 10% chance of frost after
First fall frostNovember 6median — 10% chance by Oct 20
Growing season211 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 28 and returns around November 22.

From the NOAA station Potter Valley Powerhouse, CA — 7 miles away, elevation 1,017 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 95470

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 25 – Mar 11
SpinachSow outdoors · Feb 25 – Mar 18
Broccoli, cabbageStart indoors · Jan 28 – Feb 11
Broccoli, cabbageTransplant · Mar 18 – Apr 1
Onion setsPlant outdoors · Mar 11 – Mar 25
PotatoesPlant outdoors · Mar 18 – Apr 1
LettuceSow outdoors · Mar 11 – Mar 25
Carrots, beetsSow outdoors · Mar 18 – Apr 1
TomatoesStart indoors · Feb 11 – Feb 25
TomatoesTransplant · Apr 15 – Apr 29
Peppers, eggplantStart indoors · Jan 28 – Feb 11
Peppers, eggplantTransplant · Apr 22 – May 6
BeansSow outdoors · Apr 15 – Apr 29
Sweet cornSow outdoors · Apr 15 – Apr 29
Cucumbers, squashSow outdoors · Apr 15 – Apr 29
Fall lettuce, spinachSow outdoors · Sep 11 – Sep 25
GarlicPlant cloves · Oct 23 – Nov 27
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 8) and first fall frost (Nov 6) 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 95470 came on Jan 29 — 6 days earlier than the 1991–2020 average (Feb 4).

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 Redwood Valley, CA

The soil mapped at the center of ZIP 95470 is Hopland — loam, well drained.

TextureLoama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Hopland-Sanhedrin-Kekawaka complex, 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 95470; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Redwood Valley, CA

Summer high95 °Faverage high, July
Winter low35 °Faverage low, January
Hot days82days a year at 90 °F or more
Freezing nights54nights a year at 32 °F or less
Growing degree days3,836base 50 °F — the season’s usable heat
Longest day14 h 56 mindaylight on June 21
Shortest day9 h 24 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation38.4 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 57 °F, low 35 °F 57°35° JanFebruary: average high 61 °F, low 36 °F 61°36° FebMarch: average high 66 °F, low 39 °F 66°39° MarApril: average high 71 °F, low 41 °F 71°41° AprMay: average high 79 °F, low 45 °F 79°45° MayJune: average high 87 °F, low 50 °F 87°50° JunJuly: average high 95 °F, low 54 °F 95°54° JulAugust: average high 94 °F, low 53 °F 94°53° AugSeptember: average high 90 °F, low 49 °F 90°49° SepOctober: average high 79 °F, low 43 °F 79°43° OctNovember: average high 64 °F, low 38 °F 64°38° NovDecember: average high 56 °F, low 35 °F 56°35° Dec

Precipitation by month inches

0″2″4″6″8″January: 6.91 in precipitation 6.9 JanFebruary: 6.53 in precipitation 6.5 FebMarch: 5.18 in precipitation 5.2 MarApril: 2.70 in precipitation 2.7 AprMay: 1.46 in precipitation 1.5 MayJune: 0.38 in precipitation 0.4 JunJuly: 0.03 in precipitation 0.0 JulAugust: 0.09 in precipitation 0.1 AugSeptember: 0.17 in precipitation 0.2 SepOctober: 2.04 in precipitation 2.0 OctNovember: 4.40 in precipitation 4.4 NovDecember: 8.54 in precipitation 8.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Potter Valley Powerhouse, CA (7 mi away); precipitation: Redwood Valley 1.5 Ene, CA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

954189a
Calpella, CA · 6 mi
954699a
Potter Valley, CA · 11 mi
954829a
Ukiah, CA · 11 mi
954819a
Talmage, CA · 13 mi
954909a
Willits, CA · 14 mi
954938b
Witter Springs, CA · 15 mi
954859a
Upper Lake, CA · 18 mi
954159b
Boonville, CA · 20 mi

California planting zones →

Questions about 95470

What planting zone is ZIP code 95470?

ZIP code 95470 (Redwood Valley, CA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Redwood Valley, CA?

The median last spring frost (32 °F) near 95470 is April 8; after April 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Potter Valley Powerhouse station.

When is the first frost in Redwood Valley, CA?

The median first fall frost near 95470 is November 6, giving a median frost-free growing season of 211 days.

When should I plant tomatoes in 95470?

Start tomato seeds indoors around Feb 11 – Feb 25 and set transplants outside around Apr 15 – Apr 29, one to three weeks after the median last frost.

How much rain and snow does 95470 get?

About 38.4 inches of precipitation a year (NOAA 1991–2020 normals, Redwood Valley 1.5 Ene station).

How hot do summers get in Redwood Valley, CA?

The average high peaks at 95 °F in July, with about 82 days a year at 90 °F or more.

What kind of soil does 95470 have?

The USDA soil survey maps Hopland at the center of ZIP 95470: loam, well drained, pH about 6.5 (neutral).

Did spring come early in Redwood Valley, CA in 2026?

Spring leaf-out near 95470 came on Jan 29 in 2026, 6 days earlier than the 1991–2020 average (Feb 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Redwood Valley, CA?

Intermediate onions: the longest day near 95470 is 14 h 56 min, so day-neutral types bulb best; long-day varieties may not bulb fully.