Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 91987 — Tecate, CA

ZIP code 91987 (Tecate, San Diego County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is April 30 and the first fall frost October 26.

Where ZIP 91987 is

tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostApr 30
First frostOct 26
2012 zone9b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Tecate, CA…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Tecate, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsJune 1only 10% chance of frost after
First fall frostOctober 26median — 10% chance by Sep 30
Growing season174 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 2 and returns around November 14.

From the NOAA station Campo, CA — 10 miles away, elevation 2,631 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 91987

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 31 – Sep 14
GarlicPlant cloves · Oct 12 – Nov 16
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 26) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 91987 came on Jan 19 — 9 days earlier than the 1991–2020 average (Jan 28).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Tecate, CA

The soil mapped at the center of ZIP 91987 is Las Posas — stony fine sandy loam, well drained.

TextureStony fine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Las Posas stony fine sandy loam, 9 to 30 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 91987; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Tecate, CA

Summer high95 °Faverage high, August
Winter low33 °Faverage low, December
Hot days97days a year at 90 °F or more
Freezing nights71nights a year at 32 °F or less
Growing degree days3,872base 50 °F — the season’s usable heat
Longest day14 h 18 mindaylight on June 21
Shortest day10 h 00 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation15.6 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 64 °F, low 35 °F 64°35° JanFebruary: average high 64 °F, low 35 °F 64°35° FebMarch: average high 68 °F, low 36 °F 68°36° MarApril: average high 73 °F, low 38 °F 73°38° AprMay: average high 79 °F, low 42 °F 79°42° MayJune: average high 88 °F, low 45 °F 88°45° JunJuly: average high 94 °F, low 53 °F 94°53° JulAugust: average high 95 °F, low 54 °F 95°54° AugSeptember: average high 90 °F, low 50 °F 90°50° SepOctober: average high 80 °F, low 43 °F 80°43° OctNovember: average high 71 °F, low 37 °F 71°37° NovDecember: average high 63 °F, low 33 °F 63°33° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.09 in precipitation, 0.1 in snowfall 3.1 JanFebruary: 3.45 in precipitation 3.5 FebMarch: 2.28 in precipitation 2.3 MarApril: 1.04 in precipitation, 0.1 in snowfall 1.0 AprMay: 0.38 in precipitation 0.4 MayJune: 0.09 in precipitation 0.1 JunJuly: 0.29 in precipitation 0.3 JulAugust: 0.42 in precipitation 0.4 AugSeptember: 0.40 in precipitation 0.4 SepOctober: 0.67 in precipitation 0.7 OctNovember: 1.03 in precipitation 1.0 NovDecember: 2.44 in precipitation, 0.1 in snowfall 2.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Campo, CA (10 mi away); precipitation: Campo, CA (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

6 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

919809b
Tecate, CA · <1 mi
919639a
Potrero, CA · 5 mi
9191710a
Dulzura, CA · 9 mi
919069a
Campo, CA · 10 mi
9193510a
Jamul, CA · 12 mi
919019b
Alpine, CA · 17 mi
9217910b
San Diego, CA · 18 mi
919318b
Guatay, CA · 18 mi

All 2 ZIP codes in Tecate → · California planting zones →

Questions about 91987

What planting zone is ZIP code 91987?

ZIP code 91987 (Tecate, CA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

When is the last frost in Tecate, CA?

The median last spring frost (32 °F) near 91987 is April 30; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Campo station.

When is the first frost in Tecate, CA?

The median first fall frost near 91987 is October 26, giving a median frost-free growing season of 174 days.

When should I plant tomatoes in 91987?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 91987 get?

About 15.6 inches of precipitation a year (NOAA 1991–2020 normals, Campo station).

How hot do summers get in Tecate, CA?

The average high peaks at 95 °F in August, with about 97 days a year at 90 °F or more.

What kind of soil does 91987 have?

The USDA soil survey maps Las Posas at the center of ZIP 91987: stony fine sandy loam, well drained, pH about 7.0 (neutral).

Did spring come early in Tecate, CA in 2026?

Spring leaf-out near 91987 came on Jan 19 in 2026, 9 days earlier than the 1991–2020 average (Jan 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Tecate, CA?

Short-day onions: the longest day near 91987 is 14 h 18 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.