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

Planting zone for 95548 — Klamath, CA

ZIP code 95548 (Klamath, Del Norte County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is March 16 and the first fall frost November 20.

Where ZIP 95548 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.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostMar 16
First frostNov 20
2012 zone9a

Was 9a on the 2012 map — half a zone warmer now. 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 Klamath, 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 Klamath, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 16median — 50% chance of a later frost
Safe for tender plantsApril 20only 10% chance of frost after
First fall frostNovember 20median — 10% chance by Oct 30
Growing season252 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 4 and returns around December 11.

From the NOAA station Klamath, CA — within 1 mile, elevation 30 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 95548

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 2 – Feb 16
SpinachSow outdoors · Feb 2 – Feb 23
Broccoli, cabbageStart indoors · Jan 5 – Jan 19
Broccoli, cabbageTransplant · Feb 23 – Mar 9
Onion setsPlant outdoors · Feb 16 – Mar 2
PotatoesPlant outdoors · Feb 23 – Mar 9
LettuceSow outdoors · Feb 16 – Mar 2
Carrots, beetsSow outdoors · Feb 23 – Mar 9
TomatoesStart indoors · Jan 19 – Feb 2
TomatoesTransplant · Mar 23 – Apr 6
Peppers, eggplantStart indoors · Jan 5 – Jan 19
Peppers, eggplantTransplant · Mar 30 – Apr 13
BeansSow outdoors · Mar 23 – Apr 6
Sweet cornSow outdoors · Mar 23 – Apr 6
Cucumbers, squashSow outdoors · Mar 23 – Apr 6
Fall lettuce, spinachSow outdoors · Sep 25 – Oct 9
GarlicPlant cloves · Nov 6 – Dec 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 16) and first fall frost (Nov 20) 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 95548 came on Jan 30 — 5 days earlier than the 1991–2020 average (Feb 4).

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 Klamath, CA

The soil mapped at the center of ZIP 95548 is Sisterrocks — gravelly loam, well drained.

TextureGravelly loama good balance for most vegetables
pH4.9strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter6%high
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Sisterrocks-Sasquatch-Footstep complex, 50 to 75 percent.

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 95548; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Klamath, CA

Summer high67 °Faverage high, September
Winter low38 °Faverage low, December
Hot days0days a year at 90 °F or more
Freezing nights26nights a year at 32 °F or less
Growing degree days1,481base 50 °F — the season’s usable heat
Longest day15 h 12 mindaylight on June 21
Shortest day9 h 09 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation78.9 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°32 °FJanuary: average high 55 °F, low 39 °F 55°39° JanFebruary: average high 56 °F, low 39 °F 56°39° FebMarch: average high 57 °F, low 40 °F 57°40° MarApril: average high 59 °F, low 43 °F 59°43° AprMay: average high 61 °F, low 47 °F 61°47° MayJune: average high 64 °F, low 47 °F 64°47° JunJuly: average high 66 °F, low 53 °F 66°53° JulAugust: average high 66 °F, low 51 °F 66°51° AugSeptember: average high 67 °F, low 50 °F 67°50° SepOctober: average high 63 °F, low 45 °F 63°45° OctNovember: average high 58 °F, low 41 °F 58°41° NovDecember: average high 54 °F, low 38 °F 54°38° Dec

Precipitation by month inches

0″2″4″6″8″10″12″14″16″January: 13.38 in precipitation 13.4 JanFebruary: 10.67 in precipitation 10.7 FebMarch: 10.65 in precipitation 10.7 MarApril: 6.64 in precipitation 6.6 AprMay: 3.59 in precipitation 3.6 MayJune: 1.78 in precipitation 1.8 JunJuly: 0.26 in precipitation 0.3 JulAugust: 0.33 in precipitation 0.3 AugSeptember: 1.26 in precipitation 1.3 SepOctober: 4.99 in precipitation 5.0 OctNovember: 10.09 in precipitation 10.1 NovDecember: 15.25 in precipitation 15.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Klamath, CA (within 1 mile); precipitation: Klamath, CA (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

955329b
Crescent City, CA · 14 mi
955319b
Crescent City, CA · 19 mi
955389b
Fort Dick, CA · 20 mi
955559b
Orick, CA · 20 mi
955438a
Gasquet, CA · 25 mi
955679b
Smith River, CA · 25 mi
955569a
Orleans, CA · 31 mi
955469a
Hoopa, CA · 33 mi

California planting zones →

Questions about 95548

What planting zone is ZIP code 95548?

ZIP code 95548 (Klamath, 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 Klamath, CA?

The median last spring frost (32 °F) near 95548 is March 16; after April 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Klamath station.

When is the first frost in Klamath, CA?

The median first fall frost near 95548 is November 20, giving a median frost-free growing season of 252 days.

When should I plant tomatoes in 95548?

Start tomato seeds indoors around Jan 19 – Feb 2 and set transplants outside around Mar 23 – Apr 6, one to three weeks after the median last frost.

How much rain and snow does 95548 get?

About 78.9 inches of precipitation a year (NOAA 1991–2020 normals, Klamath station).

How hot do summers get in Klamath, CA?

The average high peaks at 67 °F in September, with about 0 days a year at 90 °F or more.

What kind of soil does 95548 have?

The USDA soil survey maps Sisterrocks at the center of ZIP 95548: gravelly loam, well drained, pH about 4.9 (strongly acidic).

Did spring come early in Klamath, CA in 2026?

Spring leaf-out near 95548 came on Jan 30 in 2026, 5 days earlier than the 1991–2020 average (Feb 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Klamath, CA?

Long-day onions: the longest day near 95548 is 15 h 12 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 95548 change?

Yes. The 2012 USDA map put 95548 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.