Garden Climate for El Cajon, CA 92019

Zone 10b · Last frost ~Jan 6 · Soil 68.0°F today (modeled) · See your place on the 2023 USDA zone map

This ZIP is part of El Cajon, La Mesa, Lakeside area, where nearby ZIPs share the same stations and zone. That page compares every ZIP in the area.

Public NOAA/USDA data, updated 2026-10-16 19:24 UTC.

USDA Plant Hardiness Zone Map · El Cajon focus

2023 USDA Plant Hardiness Zone Map around ZIP 92019, marker at El Cajon, CA
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USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture. Accessed from https://planthardiness.ars.usda.gov/. Rendered unaltered from the PRISM Group, Oregon State University GIS data (https://prism.oregonstate.edu, accessed 15 Oct 2026) with official zone colors. Roads (TIGER/Line 2023 primary roads), place names (2023 Gazetteer) and state lines (2023 cartographic boundaries 1:500k) are drawn on top. Source: U.S. Census Bureau.

Zone
10b
USDA 2023 · 35 to 40°F
Last frost
Jan 6
avg last frost (50%)
Soil temp Modeled
68.0°F
↓ 12.7° in 7 days
Chill hours
—
starts Nov 1
Rain
1.31″
since Oct 1 · normal 0.19″

Frost dates for 92019

Last spring frost
Jan 6
50% odds
First fall frost
Dec 21
50% odds
Safer spring date
Feb 7
10% chance of later frost
Growing season
350
days (50%)

Earliest-risk fall date (10%): Dec 1.

NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA EL CAJON (USC00042706) 2.7 km away 27 yrs of record · 177 ft lower than this ZIP

Newsletter · 92019

Frost alerts and planting reminders for 92019. Coming soon.

Ad strip · leaderboard 970×90 / 728×90

7-day forecast · High / Low / Rain / Frost / Wind

High wind: 2 day(s) with gusts ≥40 mph. Stake and protect transplants.
Fri 16
90° 68° gust 56 mph 💧11%
High wind
Sat 17
88° 63° gust 44 mph 💧11%
High wind
Sun 18
87° 62° gust 20 mph 💧0%
Clear
Mon 19
85° 60° gust 16 mph 💧8%
Clear
Tue 20
74° 57° gust 29 mph 💧66% · 0.04″
Rain
Wed 21
71° 54° gust 24 mph 💧66% · 0.48″
Rain
Thu 22
70° 53° gust 20 mph 💧30% · 0.09″
Clear

NOAA NWS api.weather.gov (SGX). Frost = low ≤32°F · High wind = gust ≥40 mph · 💧 = chance of precipitation and expected amount (NWS quantitative precipitation forecast; blank when NWS gives none) · Rain = chance ≥50%.

What to grow when · 92019

Calendar: San Diego County, inland valleys (guide Regions 3-4). Planting months from UC Master Gardeners of San Diego County; Master Gardener Association of San Diego County. Harvest months add typical days-to-harvest. This month also checks live soil temperature and the 7-day frost forecast. The harvest planner uses the same calendar. Rules: methodology.

Affiliate links (disclosed). Placeholders, no partners yet:Frost clothSoil thermometer

Questions about 92019

What USDA hardiness zone is 92019?

ZIP 92019 (El Cajon, CA) is in USDA zone 10b (35 to 40°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.

When is the last frost in 92019?

Based on NOAA 1991–2020 normals at Ca El Cajon (2.7 km away), the median last 32°F freeze is Jan 6. In 1 of 10 years it is after Feb 7. The median first fall freeze is Dec 21.

Nearby ZIP codes

92021 El Cajon 92020 El Cajon 91978 Spring Valley 91941 La Mesa 91977 Spring Valley 91935 Jamul

Sources for this page

  • Location: US Census Bureau 2023 Gazetteer, ZCTA internal point
  • Zone: USDA Plant Hardiness Zone Map 2023, ZIP datasets (USDA ARS + PRISM Climate Group, Oregon State University)
  • Frost: NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) CA EL CAJON (USC00042706) 2.7 km away 27 yrs of record · 177 ft lower than this ZIP
  • Forecast: NOAA National Weather Service api.weather.gov (7-day forecast + gridpoint wind gusts)
  • Soil: Open-Meteo forecast API soil model (non-commercial terms)
  • Chill: Iowa Environmental Mesonet ASOS archive (NWS/FAA METAR routine + special obs; one value per clock hour)
  • Raw data: /data/zip/92019.json