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

Planting zone for 95127 — San Jose, CA

ZIP code 95127 (San Jose, Santa Clara County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.

Where ZIP 95127 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 frostrare
First frostrare
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 San Jose, 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

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station San Jose, CA — 7 miles away, elevation 66 ft) the median growing season is 362 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 95127 came on Jan 24 — 4 days earlier than the 1991–2020 average (Jan 28).

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 San Jose, CA

The soil mapped at the center of ZIP 95127 is Diablo — clay, well drained.

TextureClayholds water and nutrients; slow to drain and warm up
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Diablo clay, 15 to 30 percent slopes, MLRA 15.

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 95127; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in San Jose, CA

Summer high83 °Faverage high, August
Winter low43 °Faverage low, January
Hot days21days a year at 90 °F or more
Freezing nights2nights a year at 32 °F or less
Growing degree days4,309base 50 °F — the season’s usable heat
Longest day14 h 44 mindaylight on June 21
Shortest day9 h 35 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation18.8 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°32 °FJanuary: average high 59 °F, low 43 °F 59°43° JanFebruary: average high 63 °F, low 45 °F 63°45° FebMarch: average high 66 °F, low 48 °F 66°48° MarApril: average high 70 °F, low 50 °F 70°50° AprMay: average high 75 °F, low 53 °F 75°53° MayJune: average high 80 °F, low 57 °F 80°57° JunJuly: average high 82 °F, low 59 °F 82°59° JulAugust: average high 83 °F, low 60 °F 83°60° AugSeptember: average high 81 °F, low 58 °F 81°58° SepOctober: average high 75 °F, low 54 °F 75°54° OctNovember: average high 65 °F, low 47 °F 65°47° NovDecember: average high 59 °F, low 43 °F 59°43° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.83 in precipitation 3.8 JanFebruary: 3.46 in precipitation 3.5 FebMarch: 2.67 in precipitation 2.7 MarApril: 1.46 in precipitation 1.5 AprMay: 0.71 in precipitation 0.7 MayJune: 0.19 in precipitation 0.2 JunJuly: 0.00 in precipitation 0.0 JulAugust: 0.04 in precipitation 0.0 AugSeptember: 0.10 in precipitation 0.1 SepOctober: 0.85 in precipitation 0.8 OctNovember: 1.89 in precipitation 1.9 NovDecember: 3.60 in precipitation 3.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: San Jose, CA (7 mi away); precipitation: San Jose 3.5 Ene, CA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

951489b
San Jose, CA · 3 mi
951569b
San Jose, CA · 3 mi
951329b
San Jose, CA · 3 mi
951169b
San Jose, CA · 4 mi
951529b
San Jose, CA · 4 mi
951229b
San Jose, CA · 4 mi
951339b
San Jose, CA · 4 mi
951519b
San Jose, CA · 4 mi

All 55 ZIP codes in San Jose → · California planting zones →

Questions about 95127

What planting zone is ZIP code 95127?

ZIP code 95127 (San Jose, 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).

How much rain and snow does 95127 get?

About 18.8 inches of precipitation a year (NOAA 1991–2020 normals, San Jose 3.5 Ene station).

How hot do summers get in San Jose, CA?

The average high peaks at 83 °F in August, with about 21 days a year at 90 °F or more.

What kind of soil does 95127 have?

The USDA soil survey maps Diablo at the center of ZIP 95127: clay, well drained, pH about 7.0 (neutral).

Did spring come early in San Jose, CA in 2026?

Spring leaf-out near 95127 came on Jan 24 in 2026, 4 days earlier than the 1991–2020 average (Jan 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in San Jose, CA?

Intermediate onions: the longest day near 95127 is 14 h 44 min, so day-neutral types bulb best; long-day varieties may not bulb fully.