Okanogan, Washington, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, pawpaw, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Okanogan, 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 Okanogan 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 Okanogan — soil, climate, flood, and parcel records. How we handle your address.
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Okanogan — the short answer
Okanogan, Washington: USDA zone 7a, about 204 days between hard freezes, across 1K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~204
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 7a is Okanogan's average, not your lot's — a low corner or a tree line moves it. Against Okanogan's 204-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Okanogan
Each reading below is measured for Okanogan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOkanogan runs about 204 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredOkanogan sits in USDA hardiness zone 7a.
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 Okanogan is in
Okanogan sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Okanogan's own centroid, and it is not what its county reads: Okanogan County is mostly North Cascades. The wider page above you is answering a different question about different ground.
What Grows in Okanogan
Every plant below cleared Okanogan's own zone 7a and its 204-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Okanogan?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 24 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What's on the federal record near Okanogan
Closest first, within ~10 miles of Okanogan. Listing isn't leaking, and distance isn't exposure.
- IVANS AUTO SALES & SERVICEUnderground Storage Tanks · 150 ft
- PATEROS TRADINGUnderground Storage Tanks · 900 ft
- BEAVER TRAPUnderground Storage Tanks · 900 ft
- THE MUFFLER MANUnderground Storage Tanks · 1000 ft
- Okanogan County Public WorksUnderground Storage Tanks · 1500 ft
- KLIMEK'S CREAMERYUnderground Storage Tanks · 1500 ft
- BREWSTER CENTRAL OFFICE 4040-B01Underground Storage Tanks · 1500 ft
- THRIFTY AUTO CENTERUnderground Storage Tanks · 1600 ft
- WILLIAM WEHMEYERUnderground Storage Tanks · 1600 ft
- KENS SERVICEUnderground Storage Tanks · 1600 ft
- RALPH WEITMAN OKANOGAN TRUCK TRACTORUnderground Storage Tanks · 1800 ft
- WA DOT OKANOGAN MAINTENANCE DIVISIONUnderground Storage Tanks · 1900 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Okanogan'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 Okanogan.
Total Sites
106
within ~10 miles of Okanogan
Risk Level
Elevated
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Okanogan
Severity Distribution
within ~10 miles of Okanogan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Okanogan, Mining runs higher than the national average — 25 sites within ~10 miles of Okanogan. 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 Okanogan
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 Okanogan average
Your land is one point inside Okanogan
Everything above resolves to Okanogan as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Okanogan Average
Okanogan Average
- ●USDA Zones 7a, averaged across Okanogan
- ●One soil character for all of Okanogan
- ●Frost dates read at Okanogan's scale: Apr 3 to Oct 24
YOUR Parcel
- ✓Your exact zone, not Okanogan's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Okanogan
Pull a site-specific report for your exact address in Okanogan, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Okanogan averages can't show:
We read public map data around Okanogan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Okanogan average
How we know this about Okanogan
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 Okanogan’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 Okanogan
When does frost risk typically end in Okanogan?
The last hard freeze (28°F) in Okanogan typically lands around Apr 3, 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 Apr 24.
When is the first frost in Okanogan?
The first hard freeze (28°F) in Okanogan typically arrives around Oct 24, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 10, so the watching starts about Sep 24 — about 204 days after the spring freeze cleared.
How long is the growing season in Okanogan?
Measured between 28°F hard freezes, Okanogan sees about 204 frost-free days — roughly Apr 3 through Oct 24, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 10, about 169 days.
Is the soil safe to grow vegetables in Okanogan?
The federal record around Okanogan is a meaningful one — 106 documented sites, mostly Underground Storage Tanks entries (51), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Okanogan?
From about Sep 24 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 24 (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 24. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Okanogan's scale — its 7a band and its 204-day season. Your yard writes its own version of Okanogan'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 Okanogan’s own scale
6 of the readings below were taken at Okanogan's own scale — its own ~204-day season between 28°F freezes, the 1,287 acres it covers and 106 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Okanogan's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Okanogan's own 28°F hard-freeze dates, about Apr 3 and Oct 24 and the ~204-day span between themNOAA 1991–2020 Climate Normals
- 106 documented contamination sites on the federal record near Okanogan, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Okanogan's boundary and the 1,287 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~204-day seasonGrowable Ground crop-matching engine
- Okanogan sits in the Columbia Plateau — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Okanogan's 1,287 acres read through its county's SSURGO summaryfrom Okanogan County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Okanogan 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 Okanogan County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Okanogan's 1,287 acreswhy one lot differs from the next →
- Which side of Okanogan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,287 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 Okanogan-wide figureread your own land →