Garden Climate for Mount Laguna, CA 91948

Zone 8a · Last frost ~Apr 19 · Soil 57.0°F today (modeled) · See your place on the 2023 USDA zone map

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

USDA Plant Hardiness Zone Map · Mount Laguna focus

2023 USDA Plant Hardiness Zone Map around ZIP 91948, marker at Mount Laguna, 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
8a
USDA 2023 · 10 to 15°F
Last frost
Apr 19
avg last frost (50%)
Soil temp Modeled
57.0°F
↓ 9.8° in 7 days
Chill hours
—
unavailable
Rain
—
since Oct 1 · not enough data

Frost dates for 91948

Last spring frost
Apr 19
50% odds
First fall frost
Oct 27
50% odds
Safer spring date
May 14
10% chance of later frost
Growing season
190
days (50%)

Earliest-risk fall date (10%): Oct 9.

⚠ Heads up: the nearest usable station differs in elevation by 1,243 ft, so treat these numbers as a rough guide for your spot.

NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA CUYAMACA HCN (USC00042239) 20.6 km away 25 yrs of record · 1,243 ft lower than this ZIP

Newsletter · 91948

Frost alerts and planting reminders for 91948. Coming soon.

Ad strip · leaderboard 970×90 / 728×90

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

High wind: 1 day(s) with gusts ≥40 mph. Stake and protect transplants.
Fri 16
64° 50° gust 49 mph 💧15%
High wind
Sat 17
59° 46° gust 38 mph 💧4%
Clear
Sun 18
62° 48° gust 16 mph 💧0%
Clear
Mon 19
65° 45° gust 14 mph 💧4%
Clear
Tue 20
56° 40° gust 29 mph 💧46% · 0.02″
Clear
Wed 21
50° 37° gust 24 mph 💧66% · 0.33″
Rain
Thu 22
52° 36° gust 20 mph 💧26% · 0.07″
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 · 91948

Calendar: San Diego County, mountains (900 m / ~3,000 ft and up). Planting months from University of Arizona Cooperative Extension Yavapai County Bulletin #51 'Yavapai County Vegetable Planting Dates' (an out-of-county analog; no San Diego-specific guide covers this area). 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 91948

What USDA hardiness zone is 91948?

ZIP 91948 (Mount Laguna, CA) is in USDA zone 8a (10 to 15°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.

When is the last frost in 91948?

Based on NOAA 1991–2020 normals at Ca Cuyamaca Hcn (20.6 km away), the median last 32°F freeze is Apr 19. In 1 of 10 years it is after May 14. The median first fall freeze is Oct 27.

Nearby ZIP codes

91962 Pine Valley 91931 Guatay 91916 Descanso 91906 Campo 91901 Alpine 91905 Boulevard

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 CUYAMACA HCN (USC00042239) 20.6 km away 25 yrs of record · 1,243 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/91948.json