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

Planting zone for 92389 — Tecopa, CA

ZIP code 92389 (Tecopa, Inyo County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 29 and the first fall frost November 3.

Where ZIP 92389 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 frostMar 29

First frostNov 3

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 Tecopa, 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 Tecopa, CA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 29median — 50% chance of a later frost

Safe for tender plantsApril 21only 10% chance of frost after

First fall frostNovember 3median — 10% chance by Oct 18

Growing season218 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 6 and returns around November 13.

From the NOAA station Pahrump 4 Nw, NV — 32 miles away, elevation 2,572 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 92389

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 15 – Mar 1

SpinachSow outdoors · Feb 15 – Mar 8

Broccoli, cabbageStart indoors · Jan 18 – Feb 1

Broccoli, cabbageTransplant · Mar 8 – Mar 22

Onion setsPlant outdoors · Mar 1 – Mar 15

PotatoesPlant outdoors · Mar 8 – Mar 22

LettuceSow outdoors · Mar 1 – Mar 15

Carrots, beetsSow outdoors · Mar 8 – Mar 22

TomatoesStart indoors · Feb 1 – Feb 15

TomatoesTransplant · Apr 5 – Apr 19

Peppers, eggplantStart indoors · Jan 18 – Feb 1

Peppers, eggplantTransplant · Apr 12 – Apr 26

BeansSow outdoors · Apr 5 – Apr 19

Sweet cornSow outdoors · Apr 5 – Apr 19

Cucumbers, squashSow outdoors · Apr 5 – Apr 19

Fall lettuce, spinachSow outdoors · Sep 8 – Sep 22

GarlicPlant cloves · Oct 20 – Nov 24

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 3) 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 92389 came on Jan 28 — about the same time as the 1991–2020 average (Jan 29).

average
Jan 292026
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 Tecopa, CA

The soil mapped at the center of ZIP 92389 is Lithic Torriorthents — very gravelly fine sandy loam, somewhat excessively drained.

TextureVery gravelly fine sandy loamdrains and warms fast; dries out and needs more feeding

pH7.8slightly alkaline; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter0.3%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Lithic Torriorthents, Typic Haplocalcids, and Rock outcrop; hyperthermic hills and mountains.

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 92389; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Tecopa, CA

Summer high101 °Faverage high, July

Winter low27 °Faverage low, December

Hot days126days a year at 90 °F or more

Freezing nights79nights a year at 32 °F or less

Growing degree days5,276base 50 °F — the season’s usable heat

Longest day14 h 35 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

Precipitation4.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pahrump 4 Nw, NV (32 mi away); precipitation: Shoshone, CA (10 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.

Fort Irwin, CA · 44 mi

California planting zones →

Questions about 92389

What planting zone is ZIP code 92389?

ZIP code 92389 (Tecopa, 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 Tecopa, CA?

The median last spring frost (32 °F) near 92389 is March 29; after April 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pahrump 4 Nw station.

When is the first frost in Tecopa, CA?

The median first fall frost near 92389 is November 3, giving a median frost-free growing season of 218 days.

When should I plant tomatoes in 92389?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 92389 get?

About 4.1 inches of precipitation a year (NOAA 1991–2020 normals, Shoshone station).

How hot do summers get in Tecopa, CA?

The average high peaks at 101 °F in July, with about 126 days a year at 90 °F or more.

What kind of soil does 92389 have?

The USDA soil survey maps Lithic Torriorthents at the center of ZIP 92389: very gravelly fine sandy loam, somewhat excessively drained, pH about 7.8 (slightly alkaline).

Did spring come early in Tecopa, CA in 2026?

Spring leaf-out near 92389 came on Jan 28 in 2026, about the same as the 1991–2020 average (Jan 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Tecopa, CA?

Intermediate onions: the longest day near 92389 is 14 h 35 min, so day-neutral types bulb best; long-day varieties may not bulb fully.