The North Country / St. Lawrence Valley spans USDA hardiness zones 4b-5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
New York's short-season northern farm belt, not its mountains: a broad plain of clay and silt farm ground and dairy country along the St. Lawrence River and the eastern Lake Ontario shore. Growers here call it the North Country and garden roughly a full hardiness zone colder than downstate — about 4b inland across St. Lawrence and Lewis counties (~163–180 frost-free days) warming to 5a where Jefferson County's Lake Ontario shore lends modest lake moderation (~183 days). It is a distinct cold lowland, separate from the thin-soiled, acidic Adirondack highlands to the south. Expect garlic, kale, tomato, and rhubarb to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
The North Country / St. Lawrence Valley spans New York.
Your yard isn't all of the North Country / St. Lawrence Valley.
The North Country / St. Lawrence Valley spans USDA zones 4b-5a, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 North Country / St. Lawrence Valley — soil, climate, flood, and parcel records. How we handle your address.
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The North Country / St. Lawrence Valley — the short answer
The North Country / St. Lawrence Valley: USDA zones 4b-5a, 163–183 frost-free days, in New York.
- USDA zones
- 4b-5a
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 163–183 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 3
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the North Country / St. Lawrence Valley
Plants matched to the North Country / St. Lawrence Valley's USDA zones 4b-5a, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the North Country / St. Lawrence Valley
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the North Country / St. Lawrence Valley’s USDA zones 4b-5a — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the North Country / St. Lawrence Valley
The USDA soil survey maps this ground county by county. These are those records weighted by land area across three member counties — this region’s own profile, not a state figure.
The ground is predominantly Spodosols, at 35% of mapped acres, followed by Inceptisols (34%), Alfisols (15%) and Entisols (8%). Six soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Adams, Tunbridge, and Muskellunge.
33% of those acres are well drained, and another 14% moderately well drained, 14% somewhat poorly drained. Topsoil pH runs 4.3–6.5 between the lowest and the highest county on record. 10% of the footprint is classed prime farmland.
Soil order
Spodosols
Drainage
Well drained
Topsoil pH
4.3–6.5
Hydric soils
22%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. St. Lawrence County holds the most wetland ground here, at 24% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the North Country / St. Lawrence Valley
The soil survey reads this ground county by county, and the readings above are those records summed across the North Country / St. Lawrence Valley. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records33% of the mapped acres across the North Country / St. Lawrence Valley are well drained — ground that drains quickly. That is area-weighted across all three of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the North Country / St. Lawrence Valley runs pH 4.3–6.5 — acidic in two of its three counties.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Wet ground
From county recordsAbout 22% of the ground across the North Country / St. Lawrence Valley is mapped as hydric — wetland — soil. St. Lawrence County carries the most, at 24%.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across the North Country / St. Lawrence Valley — and how to grow with it.
Across the North Country / St. Lawrence Valley's 3 counties the federal record holds 2,212 documented sites, mostly Underground Storage Tanks (1,144), Brownfields (488) and Nitrate (324). The heaviest single county is St. Lawrence County, with 1,048.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the North Country / St. Lawrence Valley to see which records sit where you actually grow.
Sources Checked
Summed across the 3 counties in the North Country / St. Lawrence Valley
A note from Gnorman
What an experienced grower watches for around here
In and around the North Country / St. Lawrence Valley, CAFO runs higher than the national average — 113 sites across the 3 counties in the North Country / St. Lawrence Valley. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the North Country / St. Lawrence Valley
Everything above resolves to the North Country / St. Lawrence Valley as a whole — a footprint spanning USDA zones 4b-5a. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the North Country / St. Lawrence Valley Average
North Country / St. Lawrence Valley Average
- ●USDA Zones 4b-5a, averaged across North Country / St. Lawrence Valley
- ●One soil character for all of North Country / St. Lawrence Valley
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not North Country / St. Lawrence Valley's 4b-5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the North Country / St. Lawrence Valley
Pull a site-specific report for your exact address in the North Country / St. Lawrence Valley — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that North Country / St. Lawrence Valley averages can't show:
We read public map data around The North Country / St. Lawrence Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the North Country / St. Lawrence Valley average
How we know this about the North Country / St. Lawrence Valley
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the North Country / St. Lawrence Valley
What hardiness zone is the North Country / St. Lawrence Valley?
The North Country / St. Lawrence Valley spans USDA hardiness zones 4b-5a, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the North Country / St. Lawrence Valley?
Measured between 28°F hard freezes, the North Country / St. Lawrence Valley's counties mostly run 172 to 182 frost-free days, median 180 (NOAA Regional Climate Centers ACIS, 1991–2020, over 3 member counties). That 10-day spread is the honest read — no single season describes 3 counties, and each county guide below carries its own.
When does frost risk end in the North Country / St. Lawrence Valley?
Across the North Country / St. Lawrence Valley, the middle half of member counties see their last 28°F hard freeze between Apr 23 and Apr 27 (median Apr 23), and their first fall freeze between Oct 16 and Oct 22. Those are hard freezes, not the last light frost: tender transplants wait for about May 14, and elevation decides which end of a 4-day spread you garden in.
What grows well in the North Country / St. Lawrence Valley?
The North Country / St. Lawrence Valley's conditions suit plants such as Garlic, Kale, Tomato, Rhubarb, Apple, Sugar Maple. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the North Country / St. Lawrence Valley defined?
The North Country / St. Lawrence Valley is defined here as a curated cluster of 3 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the North Country / St. Lawrence Valley cover?
The North Country / St. Lawrence Valley spans New York. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Finger Lakes, Hudson Valley, Champlain Valley, Mohawk Valley, and The Adirondacks share at least one state with the North Country / St. Lawrence Valley. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the North Country / St. Lawrence Valley’s own scale
6 of the readings below were taken at the North Country / St. Lawrence Valley's own scale — the zone 4b-5a band across its footprint, a median 180-day season across its 3 counties and 2,212 documented federal contamination records across its 3 counties, 1,048 of them in St. Lawrence County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 4b-5a aggregated across all 3 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 3 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 3 counties run 172 to 182 frost-free days, median 180NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 2,212 documented federal contamination records across its 3 counties, 1,048 of them in St. Lawrence County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 35% Spodosols, topsoil pH 4.3–6.5, area-weighted across its 3 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 4b-5afrom New York
What this page can’t tell you
- Which end of the 10-day range your ground sits at — 172 days at one extreme, 182 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the North Country / St. Lawrence Valley
State growing guides
Counties in this region
Other growing regions across New York
The vast eastern mountain region of steep hollows, thin acidic soils, and short upland seasons — apples, brambles, ramps, and forest crops on hard-won ground. (Union of the core Appalachian ecoregions.)
Deep glacial lakes moderate New York's premier cool-climate wine region, where lake-effect slopes favour grapes, apples, and other tree fruit.
The Hudson River corridor's fertile valley floors and benched hillsides have grown orchards, vineyards, and market vegetables since the colonial era.
The lake-tempered lowland on both shores of Lake Champlain — clay and silt plains that make the warmest, driest, and most productive farm ground in Vermont, with apple and cold-climate wine country on the New York shore.
New York's east–west Mohawk River corridor, where cold 4a highland gives way to milder 5b valley-floor farmland across a roughly 168-day median frost-free season (last frost near the end of April, first frost around mid-October).
New York's vast northern mountain wilderness — very cold winters, thin acidic soils, and the state's shortest growing seasons.