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

Planting zone for 96104 — Cedarville, CA

ZIP code 96104 (Cedarville, Modoc County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is May 15 and the first fall frost October 1.

Where ZIP 96104 is

Outlined: the ZIP code area · 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostMay 15
First frostOct 1
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Cedarville, 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 Cedarville, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 15median — 50% chance of a later frost
Safe for tender plantsJune 6only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 16
Growing season137 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 27 and returns around October 13.

From the NOAA station Cedarville, CA — 6 miles away, elevation 4,689 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 96104

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 3 – Apr 17
SpinachSow outdoors · Apr 3 – Apr 24
Broccoli, cabbageStart indoors · Mar 6 – Mar 20
Broccoli, cabbageTransplant · Apr 24 – May 8
Onion setsPlant outdoors · Apr 17 – May 1
PotatoesPlant outdoors · Apr 24 – May 8
LettuceSow outdoors · Apr 17 – May 1
Carrots, beetsSow outdoors · Apr 24 – May 8
TomatoesStart indoors · Mar 20 – Apr 3
TomatoesTransplant · May 22 – Jun 5
Peppers, eggplantStart indoors · Mar 6 – Mar 20
Peppers, eggplantTransplant · May 29 – Jun 12
BeansSow outdoors · May 22 – Jun 5
Sweet cornSow outdoors · May 22 – Jun 5
Cucumbers, squashSow outdoors · May 22 – Jun 5
Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20
GarlicPlant cloves · Sep 17 – Oct 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 15) and first fall frost (Oct 1) 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 96104 came on Mar 9 — 18 days earlier than the 1991–2020 average (Mar 27).

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 Cedarville, CA

The soil mapped at the center of ZIP 96104 is Hussa — ashy clay loam, poorly drained.

TextureAshy clay loamholds water and nutrients; slow to drain and warm up
pH8.5alkaline; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Hussa ashy clay loam, 0 to 2 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 96104; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cedarville, CA

Summer high91 °Faverage high, July
Winter low21 °Faverage low, December
Hot days38days a year at 90 °F or more
Freezing nights156nights a year at 32 °F or less
Growing degree days2,548base 50 °F — the season’s usable heat
Longest day15 h 11 mindaylight on June 21
Shortest day9 h 10 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation13.1 inper year, rain and melted snow
Snowfall22 inper year; 26 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 44 °F, low 22 °F 44°22° JanFebruary: average high 48 °F, low 24 °F 48°24° FebMarch: average high 54 °F, low 28 °F 54°28° MarApril: average high 60 °F, low 33 °F 60°33° AprMay: average high 69 °F, low 41 °F 69°41° MayJune: average high 79 °F, low 48 °F 79°48° JunJuly: average high 91 °F, low 56 °F 91°56° JulAugust: average high 89 °F, low 53 °F 89°53° AugSeptember: average high 81 °F, low 44 °F 81°44° SepOctober: average high 67 °F, low 34 °F 67°34° OctNovember: average high 52 °F, low 27 °F 52°27° NovDecember: average high 42 °F, low 21 °F 42°21° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″January: 1.71 in precipitation, 6.1 in snowfall 1.7❄6 JanFebruary: 1.16 in precipitation, 3.3 in snowfall 1.2❄3 FebMarch: 1.48 in precipitation, 2.3 in snowfall 1.5❄2 MarApril: 1.41 in precipitation, 0.8 in snowfall 1.4❄1 AprMay: 1.35 in precipitation 1.4 MayJune: 0.67 in precipitation 0.7 JunJuly: 0.24 in precipitation 0.2 JulAugust: 0.23 in precipitation 0.2 AugSeptember: 0.34 in precipitation 0.3 SepOctober: 0.94 in precipitation, 0.3 in snowfall 0.9 OctNovember: 1.55 in precipitation, 2.8 in snowfall 1.6❄3 NovDecember: 2.04 in precipitation, 6.6 in snowfall 2.0❄7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cedarville, CA (6 mi away); precipitation: Cedarville, CA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

961106b
Eagleville, CA · 15 mi
961156b
Lake City, CA · 16 mi
961016b
Alturas, CA · 20 mi
961166b
Likely, CA · 22 mi
961086b
Davis Creek, CA · 27 mi
961126b
Fort Bidwell, CA · 30 mi
894127a
Gerlach, NV · 32 mi
976356b
New Pine Creek, OR · 34 mi

California planting zones →

Questions about 96104

What planting zone is ZIP code 96104?

ZIP code 96104 (Cedarville, CA) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Cedarville, CA?

The median last spring frost (32 °F) near 96104 is May 15; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cedarville station.

When is the first frost in Cedarville, CA?

The median first fall frost near 96104 is October 1, giving a median frost-free growing season of 137 days.

When should I plant tomatoes in 96104?

Start tomato seeds indoors around Mar 20 – Apr 3 and set transplants outside around May 22 – Jun 5, one to three weeks after the median last frost.

How much rain and snow does 96104 get?

About 13.1 inches of precipitation a year and 22 inches of snowfall (NOAA 1991–2020 normals, Cedarville station).

How hot do summers get in Cedarville, CA?

The average high peaks at 91 °F in July, with about 38 days a year at 90 °F or more.

What kind of soil does 96104 have?

The USDA soil survey maps Hussa at the center of ZIP 96104: ashy clay loam, poorly drained, pH about 8.5 (alkaline).

Did spring come early in Cedarville, CA in 2026?

Spring leaf-out near 96104 came on Mar 9 in 2026, 18 days earlier than the 1991–2020 average (Mar 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Cedarville, CA?

Long-day onions: the longest day near 96104 is 15 h 11 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).