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

Planting zone for 99841 — Tenakee Springs, AK

ZIP code 99841 (Tenakee Springs, Hoonah-Angoon County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is May 9 and the first fall frost October 4.

Where ZIP 99841 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostMay 9
First frostOct 4
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Tenakee Springs, 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 Tenakee Springs, AK

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 9median — 50% chance of a later frost
Safe for tender plantsJuly 4only 10% chance of frost after
First fall frostOctober 4median — 10% chance by Sep 1
Growing season145 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 26 and returns around October 19.

From the NOAA station Hoonah, AK — 11 miles away, elevation 131 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 99841

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 28 – Apr 11
SpinachSow outdoors · Mar 28 – Apr 18
Broccoli, cabbageStart indoors · Feb 28 – Mar 14
Broccoli, cabbageTransplant · Apr 18 – May 2
Onion setsPlant outdoors · Apr 11 – Apr 25
PotatoesPlant outdoors · Apr 18 – May 2
LettuceSow outdoors · Apr 11 – Apr 25
Carrots, beetsSow outdoors · Apr 18 – May 2
TomatoesStart indoors · Mar 14 – Mar 28
TomatoesTransplant · May 16 – May 30
Peppers, eggplantStart indoors · Feb 28 – Mar 14
Peppers, eggplantTransplant · May 23 – Jun 6
BeansSow outdoors · May 16 – May 30
Sweet cornSow outdoors · May 16 – May 30
Cucumbers, squashSow outdoors · May 16 – May 30
Fall lettuce, spinachSow outdoors · Aug 9 – Aug 23
GarlicPlant cloves · Sep 20 – Oct 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 9) and first fall frost (Oct 4) 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 7a in Alaska

289 plants native to Alaska, recorded in Alaska, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 16

Alaska cedar75 ft · blooms mid spring · low shade tolerance · to −22 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack spruce65 ft · blooms late spring · low shade tolerance · to −79 °Flodgepole pine99 ft · blooms mid summer · high shade tolerance · to −70 °Fmountain hemlock125 ft · blooms early summer · low shade tolerance · to −18 °FPacific silver fir165 ft · blooms late spring · low shade tolerance · to −28 °F

Shrubs 50

alpine bearberry0.5 ft · blooms early spring · medium shade tolerance · to −62 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °FBarclay's willow15 ft · high shade tolerance · to −43 °Fblack crowberry1 ft · blooms mid summer · high shade tolerance · to −43 °Fblack hawthorn15 ft · blooms mid spring · medium shade tolerance · to −47 °Fbog blueberry2 ft · blooms early summer · medium shade tolerance · to −38 °F

Wildflowers & perennials 125

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine aster0.3 ft · blooms early summer · medium shade tolerance · to −28 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °F

Grasses 89

Alaska brome5 ft · blooms late spring · low shade tolerance · to −18 °FAlaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °FAlpine Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Farctic bluegrass2 ft · high shade tolerance · to −62 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °F

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 Tenakee Springs, AK.

Soil in Tenakee Springs, AK

The soil mapped at the center of ZIP 99841 is Lithic Cryorthents — slightly decomposed plant material, somewhat poorly drained.

TextureSlightly decomposed plant materialtop layer
pH3.9strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter80%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Lithic Cryorthent-Entic Cryumbrept association, 76 to 140 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 99841; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Tenakee Springs, AK

Summer high65 °Faverage high, July
Winter low27 °Faverage low, January
Hot days0days a year at 90 °F or more
Freezing nights130nights a year at 32 °F or less
Growing degree days735base 50 °F — the season’s usable heat
Longest day18 h 10 mindaylight on June 21
Shortest day6 h 28 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation65.8 inper year, rain and melted snow
Snowfall90 inper year; 96 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°32 °FJanuary: average high 34 °F, low 27 °F 34°27° JanFebruary: average high 37 °F, low 27 °F 37°27° FebMarch: average high 40 °F, low 28 °F 40°28° MarApril: average high 49 °F, low 33 °F 49°33° AprMay: average high 58 °F, low 40 °F 58°40° MayJune: average high 62 °F, low 47 °F 62°47° JunJuly: average high 65 °F, low 51 °F 65°51° JulAugust: average high 64 °F, low 51 °F 64°51° AugSeptember: average high 58 °F, low 45 °F 58°45° SepOctober: average high 48 °F, low 38 °F 48°38° OctNovember: average high 39 °F, low 31 °F 39°31° NovDecember: average high 36 °F, low 28 °F 36°28° Dec

Precipitation by month inches · ❄ = snowfall

0″2″4″6″8″10″January: 6.75 in precipitation, 25 in snowfall 6.8❄25 JanFebruary: 5.02 in precipitation, 12.3 in snowfall 5.0❄12 FebMarch: 4.43 in precipitation, 20 in snowfall 4.4❄20 MarApril: 3.13 in precipitation, 1.7 in snowfall 3.1❄2 AprMay: 2.51 in precipitation 2.5 MayJune: 2.67 in precipitation 2.7 JunJuly: 3.30 in precipitation 3.3 JulAugust: 4.86 in precipitation 4.9 AugSeptember: 7.26 in precipitation 7.3 SepOctober: 9.19 in precipitation, 0.6 in snowfall 9.2❄1 OctNovember: 8.81 in precipitation, 13.4 in snowfall 8.8❄13 NovDecember: 7.86 in precipitation, 17 in snowfall 7.9❄17 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hoonah, AK (11 mi away); precipitation: Hoonah, AK (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

998297a
Hoonah, AK · 9 mi
998327a
Pelican, AK · 21 mi
998257a
Elfin Cove, AK · 30 mi
998267a
Gustavus, AK · 33 mi
998507a
Juneau, AK · 37 mi
998217a
Auke Bay, AK · 45 mi
998127a
Juneau, AK · 46 mi
998247a
Douglas, AK · 46 mi

Alaska planting zones →

Questions about 99841

What planting zone is ZIP code 99841?

ZIP code 99841 (Tenakee Springs, AK) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Tenakee Springs, AK?

The median last spring frost (32 °F) near 99841 is May 9; after July 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hoonah station.

When is the first frost in Tenakee Springs, AK?

The median first fall frost near 99841 is October 4, giving a median frost-free growing season of 145 days.

When should I plant tomatoes in 99841?

Start tomato seeds indoors around Mar 14 – Mar 28 and set transplants outside around May 16 – May 30, one to three weeks after the median last frost.

How much rain and snow does 99841 get?

About 65.8 inches of precipitation a year and 90 inches of snowfall (NOAA 1991–2020 normals, Hoonah station).

How hot do summers get in Tenakee Springs, AK?

The average high peaks at 65 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 99841 have?

The USDA soil survey maps Lithic Cryorthents at the center of ZIP 99841: slightly decomposed plant material, somewhat poorly drained, pH about 3.9 (strongly acidic).

What kind of onions grow in Tenakee Springs, AK?

Long-day onions: the longest day near 99841 is 18 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).