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

Planting zone for 99922 — Hydaburg, AK

ZIP code 99922 (Hydaburg, Prince of Wales-Hyder County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is April 14 and the first fall frost November 1.

Where ZIP 99922 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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostApr 14
First frostNov 1
2012 zone7b

Was 7b 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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hydaburg, 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 Hydaburg, AK

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 14median — 50% chance of a later frost
Safe for tender plantsMay 2only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 16
Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 22 and returns around November 23.

From the NOAA station Craig, AK — 12 miles away, elevation 43 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 99922

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 3 – Mar 17
SpinachSow outdoors · Mar 3 – Mar 24
Broccoli, cabbageStart indoors · Feb 3 – Feb 17
Broccoli, cabbageTransplant · Mar 24 – Apr 7
Onion setsPlant outdoors · Mar 17 – Mar 31
PotatoesPlant outdoors · Mar 24 – Apr 7
LettuceSow outdoors · Mar 17 – Mar 31
Carrots, beetsSow outdoors · Mar 24 – Apr 7
TomatoesStart indoors · Feb 17 – Mar 3
TomatoesTransplant · Apr 21 – May 5
Peppers, eggplantStart indoors · Feb 3 – Feb 17
Peppers, eggplantTransplant · Apr 28 – May 12
BeansSow outdoors · Apr 21 – May 5
Sweet cornSow outdoors · Apr 21 – May 5
Cucumbers, squashSow outdoors · Apr 21 – May 5
Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20
GarlicPlant cloves · Oct 18 – Nov 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 14) and first fall frost (Nov 1) 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 8a in Alaska

292 plants native to Alaska, recorded in Alaska, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 51

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 Hydaburg, AK.

Soil in Hydaburg, AK

The soil mapped at the center of ZIP 99922 is Kaikli — mucky peat, very poorly drained.

TextureMucky peattop layer
pH4.0strongly acidic; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter92.5%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Kaikli mucky peat, 0 to 35 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 99922; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hydaburg, AK

Summer high61 °Faverage high, August
Winter low32 °Faverage low, February
Hot days0days a year at 90 °F or more
Freezing nights67nights a year at 32 °F or less
Growing degree days617base 50 °F — the season’s usable heat
Longest day17 h 27 mindaylight on June 21
Shortest day7 h 06 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation99.9 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°32 °FJanuary: average high 39 °F, low 33 °F 39°33° JanFebruary: average high 40 °F, low 32 °F 40°32° FebMarch: average high 42 °F, low 33 °F 42°33° MarApril: average high 47 °F, low 37 °F 47°37° AprMay: average high 53 °F, low 43 °F 53°43° MayJune: average high 57 °F, low 48 °F 57°48° JunJuly: average high 60 °F, low 52 °F 60°52° JulAugust: average high 61 °F, low 53 °F 61°53° AugSeptember: average high 57 °F, low 48 °F 57°48° SepOctober: average high 50 °F, low 42 °F 50°42° OctNovember: average high 43 °F, low 36 °F 43°36° NovDecember: average high 40 °F, low 34 °F 40°34° Dec

Precipitation by month inches

0″2″4″6″8″10″12″14″January: 9.08 in precipitation 9.1 JanFebruary: 6.90 in precipitation 6.9 FebMarch: 8.12 in precipitation 8.1 MarApril: 7.16 in precipitation 7.2 AprMay: 5.50 in precipitation 5.5 MayJune: 3.96 in precipitation 4.0 JunJuly: 5.11 in precipitation 5.1 JulAugust: 7.34 in precipitation 7.3 AugSeptember: 10.43 in precipitation 10.4 SepOctober: 13.12 in precipitation 13.1 OctNovember: 12.34 in precipitation 12.3 NovDecember: 10.86 in precipitation 10.9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Craig, AK (12 mi away); precipitation: Craig, AK (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

999257b
Klawock, AK · 17 mi
999217b
Craig, AK · 20 mi
999197b
Thorne Bay, AK · 32 mi
999188a
Coffman Cove, AK · 44 mi
999037b
Meyers Chuck, AK · 47 mi
999288a
Ward Cove, AK · 54 mi
999278a
Point Baker, AK · 74 mi
999297b
Wrangell, AK · 77 mi

Alaska planting zones →

Questions about 99922

What planting zone is ZIP code 99922?

ZIP code 99922 (Hydaburg, AK) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Hydaburg, AK?

The median last spring frost (32 °F) near 99922 is April 14; after May 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Craig station.

When is the first frost in Hydaburg, AK?

The median first fall frost near 99922 is November 1, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 99922?

Start tomato seeds indoors around Feb 17 – Mar 3 and set transplants outside around Apr 21 – May 5, one to three weeks after the median last frost.

How much rain and snow does 99922 get?

About 99.9 inches of precipitation a year (NOAA 1991–2020 normals, Craig station).

How hot do summers get in Hydaburg, AK?

The average high peaks at 61 °F in August, with about 0 days a year at 90 °F or more.

What kind of soil does 99922 have?

The USDA soil survey maps Kaikli at the center of ZIP 99922: mucky peat, very poorly drained, pH about 4.0 (strongly acidic).

What kind of onions grow in Hydaburg, AK?

Long-day onions: the longest day near 99922 is 17 h 27 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 99922 change?

Yes. The 2012 USDA map put 99922 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.