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

Planting zone for 93270 — Terra Bella, CA

ZIP code 93270 (Terra Bella, Tulare County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.

Where ZIP 93270 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 Terra Bella, 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 Porterville, CA — 9 miles away, elevation 394 ft) the median growing season is 330 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 93270 came on Jan 30 — about the same time as the 1991–2020 average (Jan 31).

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 Terra Bella, CA

The soil mapped at the center of ZIP 93270 is Centerville — clay, well drained.

TextureClayholds water and nutrients; slow to drain and warm up
pH7.5slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Centerville clay, 2 to 5 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 93270; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Terra Bella, CA

Summer high98 °Faverage high, July
Winter low39 °Faverage low, December
Hot days122days a year at 90 °F or more
Freezing nights15nights a year at 32 °F or less
Growing degree days5,946base 50 °F — the season’s usable heat
Longest day14 h 36 mindaylight on June 21
Shortest day9 h 43 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation11 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 59 °F, low 40 °F 59°40° JanFebruary: average high 65 °F, low 43 °F 65°43° FebMarch: average high 71 °F, low 47 °F 71°47° MarApril: average high 76 °F, low 50 °F 76°50° AprMay: average high 84 °F, low 56 °F 84°56° MayJune: average high 93 °F, low 63 °F 93°63° JunJuly: average high 98 °F, low 68 °F 98°68° JulAugust: average high 97 °F, low 67 °F 97°67° AugSeptember: average high 92 °F, low 62 °F 92°62° SepOctober: average high 82 °F, low 53 °F 82°53° OctNovember: average high 68 °F, low 44 °F 68°44° NovDecember: average high 59 °F, low 39 °F 59°39° Dec

Precipitation by month inches

0″1″2″3″January: 2.08 in precipitation 2.1 JanFebruary: 1.92 in precipitation 1.9 FebMarch: 2.04 in precipitation 2.0 MarApril: 0.95 in precipitation 0.9 AprMay: 0.34 in precipitation 0.3 MayJune: 0.10 in precipitation 0.1 JunJuly: 0.05 in precipitation 0.1 JulAugust: 0.00 in precipitation 0.0 AugSeptember: 0.06 in precipitation 0.1 SepOctober: 0.55 in precipitation 0.6 OctNovember: 0.95 in precipitation 0.9 NovDecember: 1.93 in precipitation 1.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Porterville, CA (9 mi away); precipitation: Porterville, CA (9 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.

932189b
Ducor, CA · 6 mi
932589b
Porterville, CA · 10 mi
932619b
Richgrove, CA · 10 mi
932579b
Porterville, CA · 10 mi
932159b
Delano, CA · 14 mi
932199a
Earlimart, CA · 14 mi
932679b
Strathmore, CA · 14 mi
932569a
Pixley, CA · 14 mi

California planting zones →

Questions about 93270

What planting zone is ZIP code 93270?

ZIP code 93270 (Terra Bella, 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 93270 get?

About 11 inches of precipitation a year (NOAA 1991–2020 normals, Porterville station).

How hot do summers get in Terra Bella, CA?

The average high peaks at 98 °F in July, with about 122 days a year at 90 °F or more.

What kind of soil does 93270 have?

The USDA soil survey maps Centerville at the center of ZIP 93270: clay, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Terra Bella, CA in 2026?

Spring leaf-out near 93270 came on Jan 30 in 2026, about the same as the 1991–2020 average (Jan 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Terra Bella, CA?

Intermediate onions: the longest day near 93270 is 14 h 36 min, so day-neutral types bulb best; long-day varieties may not bulb fully.