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

Planting zone for 92536 — Aguanga, CA

ZIP code 92536 (Aguanga, Riverside County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is April 29 and the first fall frost November 18.

Where ZIP 92536 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 frostApr 29

First frostNov 18

2012 zone9a

Was 9a on the 2012 map — half a zone warmer now. 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 Aguanga, 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 Aguanga, CA

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsMay 29only 10% chance of frost after

First fall frostNovember 18median — 10% chance by Oct 27

Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around December 6.

From the NOAA station Palomar Mtn Obsy, CA — 8 miles away, elevation 5,551 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 92536

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 18 – Apr 1

SpinachSow outdoors · Mar 18 – Apr 8

Broccoli, cabbageStart indoors · Feb 18 – Mar 4

Broccoli, cabbageTransplant · Apr 8 – Apr 22

Onion setsPlant outdoors · Apr 1 – Apr 15

PotatoesPlant outdoors · Apr 8 – Apr 22

LettuceSow outdoors · Apr 1 – Apr 15

Carrots, beetsSow outdoors · Apr 8 – Apr 22

TomatoesStart indoors · Mar 4 – Mar 18

TomatoesTransplant · May 6 – May 20

Peppers, eggplantStart indoors · Feb 18 – Mar 4

Peppers, eggplantTransplant · May 13 – May 27

BeansSow outdoors · May 6 – May 20

Sweet cornSow outdoors · May 6 – May 20

Cucumbers, squashSow outdoors · May 6 – May 20

Fall lettuce, spinachSow outdoors · Sep 23 – Oct 7

GarlicPlant cloves · Nov 4 – Dec 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 29) and first fall frost (Nov 18) 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 92536 came on Jan 20 — 9 days earlier than the 1991–2020 average (Jan 29).

average
Jan 292026
Jan 20

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 Aguanga, CA

The soil mapped at the center of ZIP 92536 is Crouch — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding

pH6.1slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Crouch sandy loam, 8 to 15 percent slopes, eroded.

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 92536; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Aguanga, CA

Summer high84 °Faverage high, July

Winter low36 °Faverage low, February

Hot days10days a year at 90 °F or more

Freezing nights49nights a year at 32 °F or less

Growing degree days3,690base 50 °F — the season’s usable heat

Longest day14 h 22 mindaylight on June 21

Shortest day9 h 56 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation30.4 inper year, rain and melted snow

Snowfall26 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Palomar Mtn Obsy, CA (8 mi away); precipitation: Palomar Mtn Obsy, CA (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

925398b

Anza, CA · 10 mi

920609a

Palomar Mountain, CA · 10 mi

Pauma Valley, CA · 15 mi

9205910a

Pala, CA · 16 mi

920868b

Warner Springs, CA · 16 mi

925618b

Mountain Center, CA · 17 mi

California planting zones →

Questions about 92536

What planting zone is ZIP code 92536?

ZIP code 92536 (Aguanga, 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 Aguanga, CA?

The median last spring frost (32 °F) near 92536 is April 29; after May 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Palomar Mtn Obsy station.

When is the first frost in Aguanga, CA?

The median first fall frost near 92536 is November 18, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 92536?

Start tomato seeds indoors around Mar 4 – Mar 18 and set transplants outside around May 6 – May 20, one to three weeks after the median last frost.

How much rain and snow does 92536 get?

About 30.4 inches of precipitation a year and 26 inches of snowfall (NOAA 1991–2020 normals, Palomar Mtn Obsy station).

How hot do summers get in Aguanga, CA?

The average high peaks at 84 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 92536 have?

The USDA soil survey maps Crouch at the center of ZIP 92536: sandy loam, well drained, pH about 6.1 (slightly acidic).

Did spring come early in Aguanga, CA in 2026?

Spring leaf-out near 92536 came on Jan 20 in 2026, 9 days earlier than the 1991–2020 average (Jan 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Aguanga, CA?

Intermediate onions: the longest day near 92536 is 14 h 22 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 92536 change?

Yes. The 2012 USDA map put 92536 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.