Buffalo Soapstone, Alaska, sits in USDA hardiness zone 5a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Buffalo Soapstone, 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 Buffalo Soapstone 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 Buffalo Soapstone — soil, climate, flood, and parcel records. How we handle your address.
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Buffalo Soapstone — the short answer
Buffalo Soapstone, Alaska: USDA zone 5a, about 145 days between hard freezes, across 14K acres of town.
- USDA zone
- 5a
- 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
- 14K 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 5a is Buffalo Soapstone's average, not your lot's — a low corner or a tree line moves it. Against Buffalo Soapstone's 145-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Buffalo Soapstone
Each reading below is measured for Buffalo Soapstone itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsBuffalo Soapstone runs about 145 days between hard freezes (read from Matanuska-Susitna Borough, the closest normal to Buffalo Soapstone) — 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
MeasuredBuffalo Soapstone sits in USDA hardiness zone 5a.
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 Buffalo Soapstone
Every plant below cleared Buffalo Soapstone's own zone 5a and its 145-day season. Each card opens that plant's Alaska profile. How we score.
Is it too late to plant in Buffalo Soapstone?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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. When the window is tight, the fall moves are quick ones — baby greens, radishes, and garlic set for next season.
What's on the federal record near Buffalo Soapstone
Closest first, within ~10 miles of Buffalo Soapstone. Listing isn't leaking, and distance isn't exposure.
- ALASKA POLLUTION CONTROL CHEMRON FACILITYBrownfields · 0.9 mi
- Hermon Brothers Construction Co.Underground Storage Tanks · 1.3 mi
- AT & TBrownfields · 1.8 mi
- Long Rifle Lodge, LtdUnderground Storage Tanks · 1.8 mi
- ADOC - Palmer Correctional CenterUnderground Storage Tanks · 1.8 mi
- Harold Stephan,pub.Safety Bldg.Underground Storage Tanks · 1.8 mi
- Cascade StationUnderground Storage Tanks · 1.8 mi
- Sheep Mountian LodgeUnderground Storage Tanks · 1.8 mi
- Ed's TEXACOUnderground Storage Tanks · 1.8 mi
- D&A Supermarkets, Inc., dba Mom&Pop's LUSTUnderground Storage Tanks · 1.8 mi
- SA01800216ABCD2 002Nitrate · 2.2 mi
- SA01800216ABCD3 002Nitrate · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Buffalo Soapstone'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 Buffalo Soapstone.
Total Sites
278
within ~10 miles of Buffalo Soapstone
Risk Level
High
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Buffalo Soapstone
Severity Distribution
within ~10 miles of Buffalo Soapstone
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Buffalo Soapstone, two things run higher than the national average within ~10 miles of Buffalo Soapstone — Mining (32 sites) and Nitrate (144 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Buffalo Soapstone
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 Buffalo Soapstone average
Your land is one point inside Buffalo Soapstone
Everything above resolves to Buffalo Soapstone as a whole — one PHZM band, read across 14K 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 Buffalo Soapstone Average
Buffalo Soapstone Average
- ●USDA Zones 5a, averaged across Buffalo Soapstone
- ●One soil character for all of Buffalo Soapstone
- ●Frost dates read at Buffalo Soapstone's scale: May 6 to Sep 28
YOUR Parcel
- ✓Your exact zone, not Buffalo Soapstone's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Buffalo Soapstone
Pull a site-specific report for your exact address in Buffalo Soapstone, Alaska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Buffalo Soapstone averages can't show:
We read public map data around Buffalo Soapstone — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Buffalo Soapstone average
How we know this about Buffalo Soapstone
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 Buffalo Soapstone
When does frost risk typically end in Buffalo Soapstone?
The last hard freeze (28°F) in Buffalo Soapstone 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 Buffalo Soapstone?
The first hard freeze (28°F) in Buffalo Soapstone 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 Buffalo Soapstone?
Measured between 28°F hard freezes, Buffalo Soapstone 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 Buffalo Soapstone?
The federal record around Buffalo Soapstone runs heavier than most — 278 documented sites, mostly Nitrate entries (144), the nearest Brownfields record about 0.9 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do gardeners stretch the season in Buffalo Soapstone?
With about 145 frost-free days between hard freezes, Buffalo Soapstone 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 Buffalo Soapstone's scale — its 5a band and its 145-day season. Your yard writes its own version of Buffalo Soapstone'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 Buffalo Soapstone’s own scale
4 of the readings below were taken at Buffalo Soapstone's own scale — the 14,166 acres it covers and 278 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Buffalo Soapstone's own USDA hardiness band, zones 5aUSDA PHZM 2023
- 278 documented contamination sites on the federal record near Buffalo Soapstone, the closest Brownfields record about 0.9 miles out from the town centreFederal environmental registers
- Buffalo Soapstone's boundary and the 14,166 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~145-day seasonGrowable Ground crop-matching engine
Inherited from a wider read
- The 28°F hard-freeze dates — Buffalo Soapstone 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 Buffalo Soapstone's 14,166 acres read through its county's SSURGO summaryfrom Matanuska-Susitna County
- 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 Buffalo Soapstone's 14,166 acreswhy one lot differs from the next →
- Which side of Buffalo Soapstone you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 14,166 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.9 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 Buffalo Soapstone-wide figureread your own land →
More in Alaska
Wider growing context
What grows across AlaskaBuffalo Soapstone sits outside our named growing regions, so Alaska as a whole is its closest context here.
Nearby growing guides