Garden Climate for Jacumba, CA 91934

Zone 9b · Last frost ~Apr 29 · Soil 63.8°F today (modeled) · See your place on the 2023 USDA zone map

Public NOAA/USDA data, updated 2026-10-16 18:57 UTC.

USDA Plant Hardiness Zone Map · Jacumba focus

2023 USDA Plant Hardiness Zone Map around ZIP 91934, marker at Jacumba, 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
9b
USDA 2023 · 25 to 30°F
Last frost
Apr 29
avg last frost (50%)
Soil temp Modeled
63.8°F
↓ 11.1° in 7 days
Chill hours
—
unavailable
Rain
2.32″
since Oct 1 · normal 0.20″

Frost dates for 91934

Last spring frost
Apr 29
50% odds
First fall frost
Nov 1
50% odds
Safer spring date
Jun 1
10% chance of later frost
Growing season
184
days (50%)

Earliest-risk fall date (10%): Oct 5.

NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA CAMPO ASOS (USW00003164) 25.6 km away 22 yrs of record · 305 ft lower than this ZIP

Newsletter · 91934

Frost alerts and planting reminders for 91934. Coming soon.

Ad strip · leaderboard 970×90 / 728×90

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

Fri 16
74° 57° gust 39 mph 💧15%
Clear
Sat 17
66° 53° gust 29 mph 💧4%
Clear
Sun 18
70° 54° gust 20 mph 💧1%
Clear
Mon 19
74° 52° gust 18 mph 💧2%
Clear
Tue 20
67° 49° gust 36 mph 💧21%
Clear
Wed 21
61° 47° gust 33 mph 💧42% · 0.06″
Clear
Thu 22
62° 46° gust 24 mph 💧14%
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 · 91934

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 91934

What USDA hardiness zone is 91934?

ZIP 91934 (Jacumba, CA) is in USDA zone 9b (25 to 30°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.

When is the last frost in 91934?

Based on NOAA 1991–2020 normals at Ca Campo Asos (25.6 km away), the median last 32°F freeze is Apr 29. In 1 of 10 years it is after Jun 1. The median first fall freeze is Nov 1.

Nearby ZIP codes

91905 Boulevard 91906 Campo 91948 Mount Laguna 91962 Pine Valley 91963 Potrero 92036 Julian

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 CAMPO ASOS (USW00003164) 25.6 km away 22 yrs of record · 305 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: RuntimeError: not enough nearby data: no hourly weather station within 40 km on the same side of the coastal/inland divide
  • Raw data: /data/zip/91934.json