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

Planting zone for 95404 — Santa Rosa, CA

ZIP code 95404 (Santa Rosa, Sonoma County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 25 and the first fall frost December 1.

Where ZIP 95404 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.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostFeb 25
First frostDec 1
2012 zone9b

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 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Santa Rosa, 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 Santa Rosa, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 25median — 50% chance of a later frost
Safe for tender plantsMarch 29only 10% chance of frost after
First fall frostDecember 1median — 10% chance by Nov 10
Growing season279 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 20 and returns around December 16.

From the NOAA station Santa Rosa, CA — 5 miles away, elevation 167 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 95404

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 14 – Jan 28
SpinachSow outdoors · Jan 14 – Feb 4
Broccoli, cabbageStart indoors · Dec 17 – Dec 31
Broccoli, cabbageTransplant · Feb 4 – Feb 18
Onion setsPlant outdoors · Jan 28 – Feb 11
PotatoesPlant outdoors · Feb 4 – Feb 18
LettuceSow outdoors · Jan 28 – Feb 11
Carrots, beetsSow outdoors · Feb 4 – Feb 18
TomatoesStart indoors · Dec 31 – Jan 14
TomatoesTransplant · Mar 4 – Mar 18
Peppers, eggplantStart indoors · Dec 17 – Dec 31
Peppers, eggplantTransplant · Mar 11 – Mar 25
BeansSow outdoors · Mar 4 – Mar 18
Sweet cornSow outdoors · Mar 4 – Mar 18
Cucumbers, squashSow outdoors · Mar 4 – Mar 18
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 25) 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 95404 came on Jan 25 — 5 days earlier than the 1991–2020 average (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 Santa Rosa, CA

The soil mapped at the center of ZIP 95404 is Spreckels — loam, well drained.

TextureLoama good balance for most vegetables
pH6.3slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Spreckels loam, 2 to 9 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 95404; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Santa Rosa, CA

Summer high84 °Faverage high, September
Winter low38 °Faverage low, January
Hot days26days a year at 90 °F or more
Freezing nights15nights a year at 32 °F or less
Growing degree days3,509base 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
Precipitation35.3 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°32 °FJanuary: average high 60 °F, low 38 °F 60°38° JanFebruary: average high 64 °F, low 40 °F 64°40° FebMarch: average high 67 °F, low 42 °F 67°42° MarApril: average high 71 °F, low 44 °F 71°44° AprMay: average high 75 °F, low 48 °F 75°48° MayJune: average high 80 °F, low 51 °F 80°51° JunJuly: average high 82 °F, low 52 °F 82°52° JulAugust: average high 83 °F, low 53 °F 83°53° AugSeptember: average high 84 °F, low 51 °F 84°51° SepOctober: average high 79 °F, low 48 °F 79°48° OctNovember: average high 67 °F, low 42 °F 67°42° NovDecember: average high 59 °F, low 38 °F 59°38° Dec

Precipitation by month inches

0″2″4″6″January: 6.70 in precipitation 6.7 JanFebruary: 6.82 in precipitation 6.8 FebMarch: 4.83 in precipitation 4.8 MarApril: 2.44 in precipitation 2.4 AprMay: 1.49 in precipitation 1.5 MayJune: 0.35 in precipitation 0.3 JunJuly: 0.03 in precipitation 0.0 JulAugust: 0.08 in precipitation 0.1 AugSeptember: 0.17 in precipitation 0.2 SepOctober: 1.78 in precipitation 1.8 OctNovember: 3.71 in precipitation 3.7 NovDecember: 6.94 in precipitation 6.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Santa Rosa, CA (5 mi away); precipitation: Santa Rosa 1.3 Nw, CA (4 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.

954039a
Santa Rosa, CA · 4 mi
954399a
Fulton, CA · 5 mi
954029b
Santa Rosa, CA · 6 mi
954069a
Santa Rosa, CA · 6 mi
954059a
Santa Rosa, CA · 6 mi
954929a
Windsor, CA · 7 mi
954099b
Santa Rosa, CA · 7 mi
954019a
Santa Rosa, CA · 8 mi

All 8 ZIP codes in Santa Rosa → · California planting zones →

Questions about 95404

What planting zone is ZIP code 95404?

ZIP code 95404 (Santa Rosa, CA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

When is the last frost in Santa Rosa, CA?

The median last spring frost (32 °F) near 95404 is February 25; after March 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Santa Rosa station.

When is the first frost in Santa Rosa, CA?

The median first fall frost near 95404 is December 1, giving a median frost-free growing season of 279 days.

When should I plant tomatoes in 95404?

Start tomato seeds indoors around Dec 31 – Jan 14 and set transplants outside around Mar 4 – Mar 18, one to three weeks after the median last frost.

How much rain and snow does 95404 get?

About 35.3 inches of precipitation a year (NOAA 1991–2020 normals, Santa Rosa 1.3 Nw station).

How hot do summers get in Santa Rosa, CA?

The average high peaks at 84 °F in September, with about 26 days a year at 90 °F or more.

What kind of soil does 95404 have?

The USDA soil survey maps Spreckels at the center of ZIP 95404: loam, well drained, pH about 6.3 (slightly acidic).

Did spring come early in Santa Rosa, CA in 2026?

Spring leaf-out near 95404 came on Jan 25 in 2026, 5 days earlier than the 1991–2020 average (Jan 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Santa Rosa, CA?

Intermediate onions: the longest day near 95404 is 14 h 51 min, so day-neutral types bulb best; long-day varieties may not bulb fully.