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

Planting zone for 95554 — Myers Flat, CA

ZIP code 95554 (Myers Flat, Humboldt County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is March 4 and the first fall frost November 22.

Where ZIP 95554 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 4
First frostNov 22
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 Myers Flat, 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 Myers Flat, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 4median — 50% chance of a later frost
Safe for tender plantsApril 8only 10% chance of frost after
First fall frostNovember 22median — 10% chance by Nov 1
Growing season264 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 19 and returns around December 8.

From the NOAA station Grizzly Creek Sp, CA — 15 miles away, elevation 413 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 95554

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 21 – Feb 4
SpinachSow outdoors · Jan 21 – Feb 11
Broccoli, cabbageStart indoors · Dec 24 – Jan 7
Broccoli, cabbageTransplant · Feb 11 – Feb 25
Onion setsPlant outdoors · Feb 4 – Feb 18
PotatoesPlant outdoors · Feb 11 – Feb 25
LettuceSow outdoors · Feb 4 – Feb 18
Carrots, beetsSow outdoors · Feb 11 – Feb 25
TomatoesStart indoors · Jan 7 – Jan 21
TomatoesTransplant · Mar 11 – Mar 25
Peppers, eggplantStart indoors · Dec 24 – Jan 7
Peppers, eggplantTransplant · Mar 18 – Apr 1
BeansSow outdoors · Mar 11 – Mar 25
Sweet cornSow outdoors · Mar 11 – Mar 25
Cucumbers, squashSow outdoors · Mar 11 – Mar 25
Fall lettuce, spinachSow outdoors · Sep 27 – Oct 11
GarlicPlant cloves · Nov 8 – Dec 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 4) and first fall frost (Nov 22) 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 95554 came on Jan 30 — 4 days earlier than the 1991–2020 average (Feb 3).

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 Myers Flat, CA

The soil mapped at the center of ZIP 95554 is Canoecreek — gravelly slightly decomposed plant material, well drained.

TextureGravelly slightly decomposed plant materialtop layer
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter75%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Canoecreek-Sproulish-Redwohly complex, 50 to 75 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 95554; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Myers Flat, CA

Summer high73 °Faverage high, July
Winter low38 °Faverage low, January
Hot days0days a year at 90 °F or more
Freezing nights23nights a year at 32 °F or less
Growing degree days1,908base 50 °F — the season’s usable heat
Longest day15 h 03 mindaylight on June 21
Shortest day9 h 18 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation66.3 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°32 °FJanuary: average high 50 °F, low 38 °F 50°38° JanFebruary: average high 52 °F, low 39 °F 52°39° FebMarch: average high 55 °F, low 41 °F 55°41° MarApril: average high 60 °F, low 43 °F 60°43° AprMay: average high 65 °F, low 48 °F 65°48° MayJune: average high 69 °F, low 50 °F 69°50° JunJuly: average high 73 °F, low 53 °F 73°53° JulAugust: average high 73 °F, low 53 °F 73°53° AugSeptember: average high 72 °F, low 49 °F 72°49° SepOctober: average high 63 °F, low 45 °F 63°45° OctNovember: average high 54 °F, low 40 °F 54°40° NovDecember: average high 49 °F, low 38 °F 49°38° Dec

Precipitation by month inches

0″2″4″6″8″10″12″14″January: 11.78 in precipitation 11.8 JanFebruary: 10.37 in precipitation 10.4 FebMarch: 9.47 in precipitation 9.5 MarApril: 4.94 in precipitation 4.9 AprMay: 2.61 in precipitation 2.6 MayJune: 0.87 in precipitation 0.9 JunJuly: 0.14 in precipitation 0.1 JulAugust: 0.12 in precipitation 0.1 AugSeptember: 0.61 in precipitation 0.6 SepOctober: 3.72 in precipitation 3.7 OctNovember: 7.75 in precipitation 7.8 NovDecember: 13.94 in precipitation 13.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Grizzly Creek Sp, CA (15 mi away); precipitation: Miranda 4.1 Sw, CA (9 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.

955149a
Blocksburg, CA · 6 mi
955699b
Redcrest, CA · 6 mi
955539b
Miranda, CA · 7 mi
955599a
Phillipsville, CA · 7 mi
955719b
Weott, CA · 10 mi
955609b
Redway, CA · 11 mi
955269a
Bridgeville, CA · 13 mi
955119a
Alderpoint, CA · 14 mi

California planting zones →

Questions about 95554

What planting zone is ZIP code 95554?

ZIP code 95554 (Myers Flat, 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 Myers Flat, CA?

The median last spring frost (32 °F) near 95554 is March 4; after April 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Grizzly Creek Sp station.

When is the first frost in Myers Flat, CA?

The median first fall frost near 95554 is November 22, giving a median frost-free growing season of 264 days.

When should I plant tomatoes in 95554?

Start tomato seeds indoors around Jan 7 – Jan 21 and set transplants outside around Mar 11 – Mar 25, one to three weeks after the median last frost.

How much rain and snow does 95554 get?

About 66.3 inches of precipitation a year (NOAA 1991–2020 normals, Miranda 4.1 Sw station).

How hot do summers get in Myers Flat, CA?

The average high peaks at 73 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 95554 have?

The USDA soil survey maps Canoecreek at the center of ZIP 95554: gravelly slightly decomposed plant material, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Myers Flat, CA in 2026?

Spring leaf-out near 95554 came on Jan 30 in 2026, 4 days earlier than the 1991–2020 average (Feb 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Myers Flat, CA?

Long-day onions: the longest day near 95554 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).