Garden Climate for Bonsall, CA 92003

Zone 10a · Last frost ~Jan 30 · Soil 72.1°F today (measured) · See your place on the 2023 USDA zone map

This ZIP is part of Bonsall & Fallbrook, 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 · Bonsall focus

2023 USDA Plant Hardiness Zone Map around ZIP 92003, marker at Bonsall, 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
10a
USDA 2023 · 30 to 35°F
Last frost
Jan 30
avg last frost (50%)
Soil temp Measured
72.1°F
↓ 14.7° in 7 days
Chill hours
—
starts Nov 1
Rain
2.80″
since Oct 1 · normal 0.32″

Frost dates for 92003

Last spring frost
Jan 30
50% odds
First fall frost
Jan 7 (next yr)
50% odds
Safer spring date
Mar 16
10% chance of later frost
Growing season
365
days (50%)

Earliest-risk fall date (10%): Dec 14.

NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA VISTA (USC00049378) 7.6 km away 22 yrs of record · 52 ft lower than this ZIP

Newsletter · 92003

Frost alerts and planting reminders for 92003. 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
94° 69° gust 44 mph 💧1%
High wind
Sat 17
91° 64° gust 28 mph 💧2%
Clear
Sun 18
88° 63° gust 16 mph 💧1%
Clear
Mon 19
84° 61° gust 17 mph 💧9%
Clear
Tue 20
74° 58° gust 28 mph 💧66% · 0.04″
Rain
Wed 21
71° 56° gust 24 mph 💧66% · 0.68″
Rain
Thu 22
70° 55° gust 17 mph 💧32% · 0.10″
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 · 92003

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 92003

What USDA hardiness zone is 92003?

ZIP 92003 (Bonsall, CA) is in USDA zone 10a (30 to 35°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.

When is the last frost in 92003?

Based on NOAA 1991–2020 normals at Ca Vista (7.6 km away), the median last 32°F freeze is Jan 30. In 1 of 10 years it is after Mar 16. The median first fall freeze is Jan 7.

Nearby ZIP codes

92084 Vista 92057 Oceanside 92026 Escondido 92083 Vista 92028 Fallbrook 92069 San Marcos

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 VISTA (USC00049378) 7.6 km away 22 yrs of record · 52 ft lower than this ZIP
  • Forecast: NOAA National Weather Service api.weather.gov (7-day forecast + gridpoint wind gusts)
  • Soil: NOAA U.S. Climate Reference Network (USCRN) hourly02, SOIL_TEMP_10
  • Chill: Iowa Environmental Mesonet ASOS archive (NWS/FAA METAR routine + special obs; one value per clock hour)
  • Raw data: /data/zip/92003.json