International Falls, Minnesota, sits in USDA hardiness zone 3b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include cabbage, cranberry, epazote, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in International Falls, 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 International Falls 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 International Falls — soil, climate, flood, and parcel records. How we handle your address.
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International Falls — the short answer
International Falls, Minnesota: USDA zone 3b, about 144 days between hard freezes, across 4K acres of city.
- USDA zone
- 3b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~144
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 3b is International Falls's average, not your lot's — a low corner or a tree line moves it. Against International Falls's 144-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in International Falls
Each reading below is measured for International Falls itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredInternational Falls runs about 144 days between hard freezes — 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
MeasuredInternational Falls 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
The kind of country International Falls is in
International Falls sits in the Northern Minnesota Wetlands — EPA Level III, inside the wider Northern Forests. That is read at International Falls's own centroid rather than borrowed from Koochiching County.
What Grows in International Falls
Every plant below cleared International Falls's own zone 3b and its 144-day season. Each card opens that plant's Minnesota profile. How we score.
Is it too late to plant in International Falls?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 30 — 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 International Falls
Closest first, within ~10 miles of International Falls. Listing isn't leaking, and distance isn't exposure.
- Koerter's Amoco & CarwashUnderground Storage Tanks · 1800 ft
- O'REILLY AUTO PARTS - 3901Brownfields · 1800 ft
- Koochiching County GarageUnderground Storage Tanks · 1900 ft
- KOOCHICHING COUNTY HWY DEPT - SITE BBrownfields · 2200 ft
- Freedom Valu #MN0026Underground Storage Tanks · 2300 ft
- EWALDS GARAGEBrownfields · 2300 ft
- UPS - I-FALLSBrownfields · 0.5 mi
- Holiday Stationstore #380Underground Storage Tanks · 0.6 mi
- ARASON'S AUTO BODY SHOPBrownfields · 0.6 mi
- DOLLAR GENERAL 15619Brownfields · 0.6 mi
- The FishermanUnderground Storage Tanks · 0.7 mi
- RAINY RIVER VETERINARY HOSPITAL INCBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from International Falls'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 International Falls.
Total Sites
104
within ~10 miles of International Falls
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of International Falls
Severity Distribution
within ~10 miles of International Falls
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in International Falls
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 International Falls average
Your land is one point inside International Falls
Everything above resolves to International Falls as a whole — one PHZM band and one 28°F frost record, read across 4K acres. 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 International Falls Average
International Falls Average
- ●USDA Zones 3b, averaged across International Falls
- ●One soil character for all of International Falls
- ●Frost dates read at International Falls's scale: May 9 to Sep 30
YOUR Parcel
- ✓Your exact zone, not International Falls's 3b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in International Falls
Pull a site-specific report for your exact address in International Falls, Minnesota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that International Falls averages can't show:
We read public map data around International Falls — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the International Falls average
How we know this about International Falls
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 International Falls’s own record; 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 International Falls
When does frost risk typically end in International Falls?
The last hard freeze (28°F) in International Falls typically lands around May 9, 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 30.
When is the first frost in International Falls?
The first hard freeze (28°F) in International Falls typically arrives around Sep 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 16, so the watching starts about Aug 31 — about 144 days after the spring freeze cleared.
How long is the growing season in International Falls?
Measured between 28°F hard freezes, International Falls sees about 144 frost-free days — roughly May 9 through Sep 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 30 to Sep 16, about 109 days.
Is the soil safe to grow vegetables in International Falls?
The federal record around International Falls shows 104 documented sites, mostly Brownfields entries (49), the nearest Underground Storage Tanks record about 0.3 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do gardeners stretch the season in International Falls?
With about 144 frost-free days between hard freezes, International Falls 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 172 to 200 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 9 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at International Falls's scale — its 3b band and its 144-day season. Your yard writes its own version of International Falls'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 International Falls’s own scale
6 of the readings below were taken at International Falls's own scale — its own ~144-day season between 28°F freezes, the 4,351 acres it covers and 104 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- International Falls's own USDA hardiness band, zones 3bUSDA PHZM 2023
- International Falls's own 28°F hard-freeze dates, about May 9 and Sep 30 and the ~144-day span between themNOAA 1991–2020 Climate Normals
- 104 documented contamination sites on the federal record near International Falls, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- International Falls's boundary and the 4,351 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 3b and a ~144-day seasonGrowable Ground crop-matching engine
- The ecoregion at International Falls's own centroid, the Northern Minnesota WetlandsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so International Falls's 4,351 acres read through its county's SSURGO summaryfrom Koochiching County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Koochiching County
- The growing challenges every Minnesota grower plans around — written at state scale, so they stay on the state guidefrom Minnesota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Koochiching County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among International Falls's 4,351 acreswhy one lot differs from the next →
- Which side of International Falls you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,351 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 International Falls-wide figureread your own land →
More in Minnesota
Wider growing context
What grows across MinnesotaInternational Falls sits outside our named growing regions, so Minnesota as a whole is its closest context here.
Nearby growing guides