Northport, Washington, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, blackberry, california poppy, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Northport, 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 Northport 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 Northport — soil, climate, flood, and parcel records. How we handle your address.
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Northport — the short answer
Northport, Washington: USDA zone 6b, about 190 days between hard freezes, across 363 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~190
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 363 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 6b is Northport's average, not your lot's — a low corner or a tree line moves it. Against Northport's 190-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Northport
Each reading below is measured for Northport itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorthport runs about 190 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredNorthport sits in USDA hardiness zone 6b.
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 Northport is in
Northport sits in the Northern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Northport's own centroid rather than borrowed from Stevens County.
What Grows in Northport
Every plant below cleared Northport's own zone 6b and its 190-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Northport?
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 Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 21 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Northport
Closest first, within ~10 miles of Northport. Listing isn't leaking, and distance isn't exposure.
- White Bird SaloonUnderground Storage Tanks · 400 ft
- NORTHPORT PROPERTIESSuperfund · 450 ft
- RIVERS EDGE 1 STOPUnderground Storage Tanks · 500 ft
- NORTHPORT WATERFRONT HWY 25Brownfields · 950 ft
- RONALD SAUVOLAUnderground Storage Tanks · 1000 ft
- GRADE SCHOOLUnderground Storage Tanks · 1400 ft
- COUNTY SHOP NORTHPORTUnderground Storage Tanks · 1400 ft
- NORTHPORT LIMESTONE DIVISIONUnderground Storage Tanks · 1400 ft
- (Facility) Northport SmelterMining · 1600 ft
- Northern LightMining · 1900 ft
- Silver CrownMining · 2400 ft
- WA DOT NORTHPORT MAINTENANCEUnderground Storage Tanks · 2400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Northport'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 Northport.
Total Sites
133
within ~10 miles of Northport
Risk Level
High
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Northport
Severity Distribution
within ~10 miles of Northport
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Northport, Mining runs higher than the national average — 112 sites within ~10 miles of Northport. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Northport
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 Northport average
Your land is one point inside Northport
Everything above resolves to Northport as a whole — one PHZM band and one 28°F frost record, read across 363 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 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 Northport Average
Northport Average
- ●USDA Zones 6b, averaged across Northport
- ●One soil character for all of Northport
- ●Frost dates read at Northport's scale: Apr 14 to Oct 21
YOUR Parcel
- ✓Your exact zone, not Northport's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Northport
Pull a site-specific report for your exact address in Northport, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Northport averages can't show:
We read public map data around Northport — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Northport average
How we know this about Northport
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 Northport’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 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 Northport
When does frost risk typically end in Northport?
The last hard freeze (28°F) in Northport typically lands around Apr 14, 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 5.
When is the first frost in Northport?
The first hard freeze (28°F) in Northport typically arrives around Oct 21, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 7, so the watching starts about Sep 21 — about 190 days after the spring freeze cleared.
How long is the growing season in Northport?
Measured between 28°F hard freezes, Northport sees about 190 frost-free days — roughly Apr 14 through Oct 21, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 7, about 155 days.
Is the soil safe to grow vegetables in Northport?
The federal record around Northport runs heavier than most — 133 documented sites, mostly Mining entries (112), the nearest Underground Storage Tanks record under a tenth of a mile 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 I protect my plants from frost in Northport?
From about Sep 21 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 21 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 21. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Northport's scale — its 6b band and its 190-day season. Your yard writes its own version of Northport'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 Northport’s own scale
6 of the readings below were taken at Northport's own scale — its own ~190-day season between 28°F freezes, the 363 acres it covers and 133 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Northport's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Northport's own 28°F hard-freeze dates, about Apr 14 and Oct 21 and the ~190-day span between themNOAA 1991–2020 Climate Normals
- 133 documented contamination sites on the federal record near Northport, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Northport's boundary and the 363 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~190-day seasonGrowable Ground crop-matching engine
- The ecoregion at Northport's own centroid, the Northern RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Northport's 363 acres read through its county's SSURGO summaryfrom Stevens County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Stevens County
- The growing challenges every Washington grower plans around — written at state scale, so they stay on the state guidefrom Washington
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Stevens County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Northport's 363 acreswhy one lot differs from the next →
- Which side of Northport you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 363 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Northport-wide figureread your own land →