Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 99675 — Takotna, AK

ZIP code 99675 (Takotna, Yukon-Koyukuk (CA) County) is in USDA zone 2a: the coldest winter night averages −50 to −45 °F. The median last spring frost is May 13 and the first fall frost September 13.

Where ZIP 99675 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.

Zone2a−50 to −45 °F

Coldest night−45.6 to −42.8 °C

Last frostMay 13

First frostSep 13

2012 zone3a

Was 3a on the 2012 map — a full zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 2a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Takotna, AK…

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 Takotna, AK

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 13median — 50% chance of a later frost

Safe for tender plantsMay 28only 10% chance of frost after

First fall frostSeptember 13median — 10% chance by Aug 27

Growing season120 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 4 and returns around September 25.

From the NOAA station Mcgrath Airport, AK — 14 miles away, elevation 335 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 99675

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 1 – Apr 15

SpinachSow outdoors · Apr 1 – Apr 22

Broccoli, cabbageStart indoors · Mar 4 – Mar 18

Broccoli, cabbageTransplant · Apr 22 – May 6

Onion setsPlant outdoors · Apr 15 – Apr 29

PotatoesPlant outdoors · Apr 22 – May 6

LettuceSow outdoors · Apr 15 – Apr 29

Carrots, beetsSow outdoors · Apr 22 – May 6

TomatoesStart indoors · Mar 18 – Apr 1

TomatoesTransplant · May 20 – Jun 3

Peppers, eggplantStart indoors · Mar 4 – Mar 18

Peppers, eggplantTransplant · May 27 – Jun 10

BeansSow outdoors · May 20 – Jun 3

Sweet cornSow outdoors · May 20 – Jun 3

Cucumbers, squashSow outdoors · May 20 – Jun 3

Fall lettuce, spinachSow outdoors · Jul 19 – Aug 2

GarlicPlant cloves · Aug 30 – Oct 4

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 13) and first fall frost (Sep 13) 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.

Native plants for zone 2a in Alaska

44 plants native to Alaska, recorded in Alaska, and rated by the USDA to survive −50 °F or colder — the bottom of zone 2a. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Takotna, AK.

Soil in Takotna, AK

The soil mapped at the center of ZIP 99675 is E29-boreal taiga-loamy frozen terraces — peat, poorly drained.

TexturePeattop layer

DrainagePoorly drainedconsider raised beds

Organic matter75%high

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Interior Alaska Lowlands-Boreal Lowland-High Flood Plains and Terraces.

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 99675; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Takotna, AK

Summer high70 °Faverage high, July

Winter low−14 °Faverage low, January

Hot days0days a year at 90 °F or more

Freezing nights221nights a year at 32 °F or less

Growing degree days884base 50 °F — the season’s usable heat

Longest day20 h 18 mindaylight on June 21

Shortest day4 h 43 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation18.1 inper year, rain and melted snow

Snowfall87 inper year; 191 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mcgrath Airport, AK (14 mi away); precipitation: Mcgrath Airport, AK (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

996272b

Mc Grath, AK · 60 mi

996563a

Red Devil, AK · 88 mi

996682b

Sleetmute, AK · 98 mi

995573a

Aniak, AK · 108 mi

Alaska planting zones →

Questions about 99675

What planting zone is ZIP code 99675?

ZIP code 99675 (Takotna, AK) is in USDA hardiness zone 2a on the 2023 map: the coldest night of an average winter reaches −50 to −45 °F (−45.6 to −42.8 °C).

When is the last frost in Takotna, AK?

The median last spring frost (32 °F) near 99675 is May 13; after May 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mcgrath Airport station.

When is the first frost in Takotna, AK?

The median first fall frost near 99675 is September 13, giving a median frost-free growing season of 120 days.

When should I plant tomatoes in 99675?

Start tomato seeds indoors around Mar 18 – Apr 1 and set transplants outside around May 20 – Jun 3, one to three weeks after the median last frost.

How much rain and snow does 99675 get?

About 18.1 inches of precipitation a year and 87 inches of snowfall (NOAA 1991–2020 normals, Mcgrath Airport station).

How hot do summers get in Takotna, AK?

The average high peaks at 70 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 99675 have?

The USDA soil survey maps E29-boreal taiga-loamy frozen terraces at the center of ZIP 99675: peat, poorly drained.

What kind of onions grow in Takotna, AK?

Long-day onions: the longest day near 99675 is 20 h 18 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 99675 change?

Yes. The 2012 USDA map put 99675 in zone 3a; the 2023 map puts it in zone 2a. The newer map uses 1991–2020 data and more weather stations.