Skwentna, Alaska, sits in USDA hardiness zone 3a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, potato, rhubarb, and kale, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Skwentna, 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 Skwentna 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 Skwentna — soil, climate, flood, and parcel records. How we handle your address.
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Skwentna — the short answer
Skwentna, Alaska: USDA zone 3a, about 145 days between hard freezes, across 281K acres of town.
- USDA zone
- 3a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- Matanuska-Susitna Borough normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Sep 28
- Matanuska-Susitna Borough normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~145
- Matanuska-Susitna Borough normal — NOAA 1991–2020, nearest to this town
- Town area
- 281K 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 Matanuska-Susitna Borough’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 3a is Skwentna's average, not your lot's — a low corner or a tree line moves it. Against Skwentna's 145-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Skwentna
Each reading below is measured for Skwentna itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSkwentna runs about 145 days between hard freezes (read from Matanuska-Susitna Borough, the closest normal to Skwentna) — 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
MeasuredSkwentna sits in USDA hardiness zone 3a.
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 Skwentna
Plants matched to Skwentna's USDA zones 3a, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Skwentna?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Apr 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 28 — long-season crops need about 90 days of runway, quick greens only 30. Short seasons reward decisiveness — quick-maturing varieties late, hardy greens under cover, and next year’s garlic in the ground before it closes.
What's on the federal record near Skwentna
Closest first, within ~10 miles of Skwentna. Listing isn't leaking, and distance isn't exposure.
- COOK INLET REGION INCBrownfields · 5.3 mi
- NORTHWOOD SERVICESBrownfields · 7.6 mi
Measured from Skwentna'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 Skwentna.
Severity Distribution
within ~10 miles of Skwentna
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Skwentna
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 Skwentna average
Your land is one point inside Skwentna
Everything above resolves to Skwentna as a whole — one PHZM band, read across 281K acres, with hard-freeze dates borrowed from Matanuska-Susitna Borough’s record because no 30-year normal resolves at this town’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 town 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 Skwentna Average
Skwentna Average
- ●USDA Zones 3a, averaged across Skwentna
- ●One soil character for all of Skwentna
- ●Frost dates read at Skwentna's scale: May 6 to Sep 28
YOUR Parcel
- ✓Your exact zone, not Skwentna's 3a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Skwentna
Pull a site-specific report for your exact address in Skwentna, Alaska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Skwentna averages can't show:
We read public map data around Skwentna — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Skwentna average
How we know this about Skwentna
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Matanuska-Susitna Borough’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 town grain anywhere on this page — there is no town-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 Skwentna
When does frost risk typically end in Skwentna?
The last hard freeze (28°F) in Skwentna typically lands around May 6, 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 27.
When is the first frost in Skwentna?
The first hard freeze (28°F) in Skwentna typically arrives around Sep 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 14, so the watching starts about Aug 29 — about 145 days after the spring freeze cleared.
How long is the growing season in Skwentna?
Measured between 28°F hard freezes, Skwentna sees about 145 frost-free days — roughly May 6 through Sep 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 14, about 110 days.
Is the soil safe to grow vegetables in Skwentna?
The federal record around Skwentna is light — 2 documented sites across the 9 federal source types we checked, mostly Brownfields entries (2), the nearest Brownfields record about 5.3 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 Skwentna?
With about 145 frost-free days between hard freezes, Skwentna 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 173 to 201 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 6 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Skwentna's scale — its 3a band and its 145-day season. Your yard writes its own version of Skwentna'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 Skwentna’s own scale
3 of the readings below were taken at Skwentna's own scale — the 280,712 acres it covers and 2 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Skwentna's own USDA hardiness band, zones 3aUSDA PHZM 2023
- 2 documented contamination sites on the federal record near Skwentna, the closest Brownfields record about 5.3 miles out from the town centreFederal environmental registers
- Skwentna's boundary and the 280,712 acres inside itUS Census TIGER/Line 2025
Inherited from a wider read
- The 28°F hard-freeze dates — Skwentna has no normal of its own, so its county's is the closest measured readfrom Matanuska-Susitna Borough
- Soil character — no town-scale survey exists, so Skwentna's 280,712 acres read through its county's SSURGO summaryfrom Matanuska-Susitna County
- The candidate plant list — Alaska's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom Alaska
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Matanuska-Susitna 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 Matanuska-Susitna County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Skwentna's 280,712 acreswhy one lot differs from the next →
- Which side of Skwentna you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 280,712 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 5.3 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 Skwentna-wide figureread your own land →
More in Alaska
Wider growing context
What grows across AlaskaSkwentna sits outside our named growing regions, so Alaska as a whole is its closest context here.
Nearby growing guides