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

Planting zone for 96046 — Hyampom, CA

ZIP code 96046 (Hyampom, Trinity County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is April 16 and the first fall frost October 31.

Where ZIP 96046 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostApr 16
First frostOct 31
2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hyampom, 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 Hyampom, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 3only 10% chance of frost after
First fall frostOctober 31median — 10% chance by Oct 13
Growing season197 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 17 and returns around November 19.

From the NOAA station Big Bar 4 E, CA — 15 miles away, elevation 1,253 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 96046

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19
GarlicPlant cloves · Oct 17 – Nov 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 31) 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 96046 came on Feb 4 — 14 days earlier than the 1991–2020 average (Feb 18).

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 Hyampom, CA

The soil mapped at the center of ZIP 96046 is Holland family — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables
pH6.4slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Holland family, deep, 20 to 40 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 96046; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hyampom, CA

Summer high97 °Faverage high, July
Winter low34 °Faverage low, January
Hot days90days a year at 90 °F or more
Freezing nights59nights a year at 32 °F or less
Growing degree days3,431base 50 °F — the season’s usable heat
Longest day15 h 05 mindaylight on June 21
Shortest day9 h 16 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation35.8 inper year, rain and melted snow
Snowfall3 inper year; 2 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 50 °F, low 34 °F 50°34° JanFebruary: average high 56 °F, low 35 °F 56°35° FebMarch: average high 62 °F, low 37 °F 62°37° MarApril: average high 69 °F, low 39 °F 69°39° AprMay: average high 78 °F, low 44 °F 78°44° MayJune: average high 86 °F, low 48 °F 86°48° JunJuly: average high 97 °F, low 53 °F 97°53° JulAugust: average high 95 °F, low 52 °F 95°52° AugSeptember: average high 89 °F, low 47 °F 89°47° SepOctober: average high 74 °F, low 41 °F 74°41° OctNovember: average high 57 °F, low 38 °F 57°38° NovDecember: average high 48 °F, low 34 °F 48°34° Dec

Precipitation by month inches · ❄ = snowfall

0″2″4″6″8″January: 6.41 in precipitation, 0.7 in snowfall 6.4❄1 JanFebruary: 5.37 in precipitation, 0.4 in snowfall 5.4 FebMarch: 4.58 in precipitation, 0.3 in snowfall 4.6 MarApril: 2.62 in precipitation 2.6 AprMay: 1.67 in precipitation 1.7 MayJune: 0.73 in precipitation 0.7 JunJuly: 0.17 in precipitation 0.2 JulAugust: 0.20 in precipitation 0.2 AugSeptember: 0.44 in precipitation 0.4 SepOctober: 2.20 in precipitation 2.2 OctNovember: 4.19 in precipitation, 0.2 in snowfall 4.2 NovDecember: 7.24 in precipitation, 1.1 in snowfall 7.2❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Big Bar 4 E, CA (15 mi away); precipitation: Big Bar 4 E, CA (15 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

960418b
Hayfork, CA · 14 mi
955269a
Bridgeville, CA · 17 mi
955528b
Mad River, CA · 18 mi
955639a
Salyer, CA · 21 mi
955278b
Burnt Ranch, CA · 24 mi
955739a
Willow Creek, CA · 24 mi
955149a
Blocksburg, CA · 26 mi
960108b
Big Bar, CA · 26 mi

California planting zones →

Questions about 96046

What planting zone is ZIP code 96046?

ZIP code 96046 (Hyampom, CA) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Hyampom, CA?

The median last spring frost (32 °F) near 96046 is April 16; after May 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Big Bar 4 E station.

When is the first frost in Hyampom, CA?

The median first fall frost near 96046 is October 31, giving a median frost-free growing season of 197 days.

When should I plant tomatoes in 96046?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 96046 get?

About 35.8 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Big Bar 4 E station).

How hot do summers get in Hyampom, CA?

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

What kind of soil does 96046 have?

The USDA soil survey maps Holland family at the center of ZIP 96046: gravelly loam, well drained, pH about 6.4 (slightly acidic).

Did spring come early in Hyampom, CA in 2026?

Spring leaf-out near 96046 came on Feb 4 in 2026, 14 days earlier than the 1991–2020 average (Feb 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hyampom, CA?

Long-day onions: the longest day near 96046 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).