Upper Kalskag, Alaska, sits in USDA hardiness zone 3b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
A short list that earns its place here — cabbage, cranberry, epazote, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Upper Kalskag, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Upper Kalskag lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Upper Kalskag — soil, climate, flood, and parcel records. How we handle your address.
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Upper Kalskag — the short answer
Upper Kalskag, Alaska: USDA zone 3b, about 142 days between hard freezes, across 2K acres of city.
- USDA zone
- 3b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 10
- Bethel Census Area normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Sep 29
- Bethel Census Area normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~142
- Bethel Census Area normal — NOAA 1991–2020, nearest to this town
- City area
- 2K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Bethel Census Area’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 3b is Upper Kalskag's average, not your lot's — a low corner or a tree line moves it. Against Upper Kalskag's 142-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Upper Kalskag
Each reading below is measured for Upper Kalskag itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsUpper Kalskag runs about 142 days between hard freezes (read from Bethel Census Area, the closest normal to Upper Kalskag) — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredUpper Kalskag sits in USDA hardiness zone 3b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
What Grows in Upper Kalskag
Every plant below cleared Upper Kalskag's own zone 3b and its 142-day season. Each card opens that plant's Alaska profile. How we score.
Is it too late to plant in Upper Kalskag?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Apr 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 29 — long-season crops need about 90 days of runway, quick greens only 30. In a season this compact, fast finishers and cold-hardy greens do the late work, and garlic tucked in before the freeze repays you next summer.
What's on the federal record near Upper Kalskag
Closest first, within ~10 miles of Upper Kalskag. Listing isn't leaking, and distance isn't exposure.
- SB01706127ACAA1 001Nitrate · 1.3 mi
- SB01606202BBBD3 001Nitrate · 1.9 mi
- SB01606202BBBD1 001Nitrate · 1.9 mi
- SB01606202BBBD2 001Nitrate · 1.9 mi
Measured from Upper Kalskag's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Upper Kalskag.
Total Sites
8
within ~10 miles of Upper Kalskag
Risk Level
Low
Highest-severity
8 nitrate monitoring sites
Severity Distribution
within ~10 miles of Upper Kalskag
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Upper Kalskag
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Upper Kalskag average
Your land is one point inside Upper Kalskag
Everything above resolves to Upper Kalskag as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Bethel Census Area’s record because no 30-year normal resolves at this city’s own centroid. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Upper Kalskag Average
Upper Kalskag Average
- ●USDA Zones 3b, averaged across Upper Kalskag
- ●One soil character for all of Upper Kalskag
- ●Frost dates read at Upper Kalskag's scale: May 10 to Sep 29
YOUR Parcel
- ✓Your exact zone, not Upper Kalskag's 3b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Upper Kalskag
Pull a site-specific report for your exact address in Upper Kalskag, Alaska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Upper Kalskag averages can't show:
We read public map data around Upper Kalskag — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Upper Kalskag average
How we know this about Upper Kalskag
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Bethel Census Area’s record, because none resolves here; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Upper Kalskag
When does frost risk typically end in Upper Kalskag?
The last hard freeze (28°F) in Upper Kalskag typically lands around May 10, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 31.
When is the first frost in Upper Kalskag?
The first hard freeze (28°F) in Upper Kalskag typically arrives around Sep 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 15, so the watching starts about Aug 30 — about 142 days after the spring freeze cleared.
How long is the growing season in Upper Kalskag?
Measured between 28°F hard freezes, Upper Kalskag sees about 142 frost-free days — roughly May 10 through Sep 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 31 to Sep 15, about 107 days.
Is the soil safe to grow vegetables in Upper Kalskag?
The federal record around Upper Kalskag is light — 8 documented sites across the 9 federal source types we checked, mostly Nitrate entries (8), the nearest Nitrate record about 1.3 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do gardeners stretch the season in Upper Kalskag?
With about 142 frost-free days between hard freezes, Upper Kalskag rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 170 to 198 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 10 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Upper Kalskag's scale — its 3b band and its 142-day season. Your yard writes its own version of Upper Kalskag's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Upper Kalskag’s own scale
4 of the readings below were taken at Upper Kalskag's own scale — the 2,308 acres it covers and 8 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Upper Kalskag's own USDA hardiness band, zones 3bUSDA PHZM 2023
- 8 documented contamination sites on the federal record near Upper Kalskag, the closest Nitrate record about 1.3 miles out from the town centreFederal environmental registers
- Upper Kalskag's boundary and the 2,308 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 3b and a ~142-day seasonGrowable Ground crop-matching engine
Inherited from a wider read
- The 28°F hard-freeze dates — Upper Kalskag has no normal of its own, so its county's is the closest measured readfrom Bethel Census Area
- Soil character — no town-scale survey exists, so Upper Kalskag's 2,308 acres read through its county's SSURGO summaryfrom Bethel County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Bethel County
- The growing challenges every Alaska grower plans around — written at state scale, so they stay on the state guidefrom Alaska
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Bethel County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Upper Kalskag's 2,308 acreswhy one lot differs from the next →
- Which side of Upper Kalskag you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,308 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 1.3 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Upper Kalskag-wide figureread your own land →
More in Alaska
Wider growing context
What grows across AlaskaUpper Kalskag sits outside our named growing regions, so Alaska as a whole is its closest context here.
Nearby growing guides