Fort Klamath, Oregon, sits in USDA hardiness zone 6b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: okra, blackberry, california poppy, and pumpkin. The site-level story — soil, sun, drainage — decides the rest.
Even in Fort Klamath, 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 Fort Klamath 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 Fort Klamath — soil, climate, flood, and parcel records. How we handle your address.
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Fort Klamath — the short answer
Fort Klamath, Oregon: USDA zone 6b, about 114 days between hard freezes, across 154 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~114
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 154 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 Fort Klamath's average, not your lot's — a low corner or a tree line moves it. Against Fort Klamath's 114-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Fort Klamath
Each reading below is measured for Fort Klamath itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFort Klamath runs about 114 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
MeasuredFort Klamath 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 Fort Klamath is in
Fort Klamath sits in the Eastern Cascades Slopes and Foothills — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Fort Klamath's own centroid rather than borrowed from Klamath County.
What Grows in Fort Klamath
Every plant below cleared Fort Klamath's own zone 6b and its 114-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Fort Klamath?
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 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 19 — long-season crops need about 90 days of runway, quick greens only 30. Short seasons reward decisiveness — quick-maturing varieties late, hardy greens under cover, and next year’s garlic in the ground before it closes.
What's on the federal record near Fort Klamath
Closest first, within ~10 miles of Fort Klamath. Listing isn't leaking, and distance isn't exposure.
- WILSON, CARL FUnderground Storage Tanks · 500 ft
- PUBLIC WORKS DEPTUnderground Storage Tanks · 800 ft
- OR STATE HWYUnderground Storage Tanks · 1.4 mi
- KLAMATH STATE FISH HATCHERYBrownfields · 4.4 mi
- FLOWING WELL NR SEVENMILE CREEK BELOW SHORT CREEKNitrate · 4.7 mi
- SEVEN-MILE GUARD STATIONUnderground Storage Tanks · 4.8 mi
- WOOD R RANCH PUMICE PIEZOMETER NO. 1Nitrate · 6.1 mi
- WOOD RIVER RANCH ARTESIAN WELL NO. 1Nitrate · 6.2 mi
- AGENCY PROPERTYUnderground Storage Tanks · 6.6 mi
- 34S/07X-14CDD1Nitrate · 7.1 mi
- CHILOQUIN RS - WINEMA NAT'L FORESTUnderground Storage Tanks · 7.5 mi
- 34S/07X-24BDD1Nitrate · 7.7 mi
5 more sites are on the record inside the same radius. See them on the map
Measured from Fort Klamath'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 Fort Klamath.
Sources Checked
within ~10 miles of Fort Klamath
Severity Distribution
within ~10 miles of Fort Klamath
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Fort Klamath, Nitrate runs higher than the national average — 18 sites within ~10 miles of Fort Klamath. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Fort Klamath
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 Fort Klamath average
Your land is one point inside Fort Klamath
Everything above resolves to Fort Klamath as a whole — one PHZM band and one 28°F frost record, read across 154 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 Fort Klamath Average
Fort Klamath Average
- ●USDA Zones 6b, averaged across Fort Klamath
- ●One soil character for all of Fort Klamath
- ●Frost dates read at Fort Klamath's scale: May 28 to Sep 19
YOUR Parcel
- ✓Your exact zone, not Fort Klamath's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Fort Klamath
Pull a site-specific report for your exact address in Fort Klamath, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Fort Klamath averages can't show:
We read public map data around Fort Klamath — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Fort Klamath average
How we know this about Fort Klamath
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 Fort Klamath’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 Fort Klamath
When does frost risk typically end in Fort Klamath?
The last hard freeze (28°F) in Fort Klamath typically lands around May 28, 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 Jun 18.
When is the first frost in Fort Klamath?
The first hard freeze (28°F) in Fort Klamath typically arrives around Sep 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 5, so the watching starts about Aug 20 — about 114 days after the spring freeze cleared.
How long is the growing season in Fort Klamath?
Measured between 28°F hard freezes, Fort Klamath sees about 114 frost-free days — roughly May 28 through Sep 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 18 to Sep 5, about 79 days.
Is the soil safe to grow vegetables in Fort Klamath?
The federal record around Fort Klamath is light — 26 documented sites across the 9 federal source types we checked, mostly Nitrate entries (18), the nearest Underground Storage Tanks record under a tenth of a mile out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do gardeners stretch the season in Fort Klamath?
With about 114 frost-free days between hard freezes, Fort Klamath 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 142 to 170 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 28 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Fort Klamath's scale — its 6b band and its 114-day season. Your yard writes its own version of Fort Klamath'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 Fort Klamath’s own scale
6 of the readings below were taken at Fort Klamath's own scale — its own ~114-day season between 28°F freezes, the 154 acres it covers and 26 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Fort Klamath's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Fort Klamath's own 28°F hard-freeze dates, about May 28 and Sep 19 and the ~114-day span between themNOAA 1991–2020 Climate Normals
- 26 documented contamination sites on the federal record near Fort Klamath, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Fort Klamath's boundary and the 154 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~114-day seasonGrowable Ground crop-matching engine
- The ecoregion at Fort Klamath's own centroid, the Eastern Cascades Slopes and FoothillsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Fort Klamath's 154 acres read through its county's SSURGO summaryfrom Klamath County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Klamath County
- The growing challenges every Oregon grower plans around — written at state scale, so they stay on the state guidefrom Oregon
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Klamath County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Fort Klamath's 154 acreswhy one lot differs from the next →
- Which side of Fort Klamath you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 154 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 Fort Klamath-wide figureread your own land →
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