Garden Climate for Boulevard, CA 91905

Zone 9a · Last frost ~Apr 29 · Soil 61.7°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 · Boulevard focus

2023 USDA Plant Hardiness Zone Map around ZIP 91905, marker at Boulevard, 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
9a
USDA 2023 · 20 to 25°F
Last frost
Apr 29
avg last frost (50%)
Soil temp Modeled
61.7°F
↓ 13.2° in 7 days
Chill hours
—
unavailable
Rain
2.32″
since Oct 1 · normal 0.20″

Frost dates for 91905

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.

⚠ Heads up: the nearest usable station differs in elevation by 1,211 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 CAMPO ASOS (USW00003164) 14.8 km away 22 yrs of record · 1,211 ft lower than this ZIP

Newsletter · 91905

Frost alerts and planting reminders for 91905. Coming soon.

Ad strip · leaderboard 970×90 / 728×90

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

High wind: 3 day(s) with gusts ≥40 mph. Stake and protect transplants.
Fri 16
71° 58° gust 49 mph 💧15% · 0.01″
High wind
Sat 17
63° 55° gust 36 mph 💧4% · 0.03″
Clear
Sun 18
67° 56° gust 23 mph 💧1%
Clear
Mon 19
70° 52° gust 21 mph 💧3%
Clear
Tue 20
62° 50° gust 41 mph 💧33%
High wind
Wed 21
56° 47° gust 41 mph 💧56% · 0.13″
High windRain
Thu 22
58° 47° gust 25 mph 💧18% · 0.02″
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 · 91905

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 91905

What USDA hardiness zone is 91905?

ZIP 91905 (Boulevard, CA) is in USDA zone 9a (20 to 25°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.

When is the last frost in 91905?

Based on NOAA 1991–2020 normals at Ca Campo Asos (14.8 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

91934 Jacumba 91906 Campo 91948 Mount Laguna 91963 Potrero 91962 Pine Valley 91931 Guatay

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) 14.8 km away 22 yrs of record · 1,211 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/91905.json