Heppner, Oregon, sits in USDA hardiness zone 7a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, pawpaw, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Heppner, 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 Heppner 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 Heppner — soil, climate, flood, and parcel records. How we handle your address.
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Heppner — the short answer
Heppner, Oregon: USDA zone 7a, about 195 days between hard freezes, across 787 acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~195
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 787 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 Heppner's average, not your lot's — a low corner or a tree line moves it. Against Heppner's 195-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Heppner
Each reading below is measured for Heppner itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHeppner runs about 195 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
MeasuredHeppner 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 Heppner is in
Heppner sits in the Columbia Plateau — EPA Level III, inside the wider North American Deserts. That is read at Heppner's own centroid rather than borrowed from Morrow County.
What Grows in Heppner
Every plant below cleared Heppner's own zone 7a and its 195-day season. Each card opens that plant's Oregon profile. How we score.
Is it too late to plant in Heppner?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 25 — 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 Heppner
Closest first, within ~10 miles of Heppner. Listing isn't leaking, and distance isn't exposure.
- SHEAR, RUBYUnderground Storage Tanks · 1800 ft
- USDA USFS R06 UMATILLA NF HEPPNER DISTBrownfields · 1800 ft
- HEPPNER RANGER DISTRICTUnderground Storage Tanks · 1800 ft
- TUPPER GUARD STATIONUnderground Storage Tanks · 1800 ft
- MORROW COUNTY MOTOR POOLUnderground Storage Tanks · 1800 ft
- D & L REPAIR SERVICEUnderground Storage Tanks · 1900 ft
- BANK OF EASTERN OREGONUnderground Storage Tanks · 2000 ft
- MILLER'S MINI-MART & CHEVRONUnderground Storage Tanks · 2100 ft
- HEPPNER SHELLUnderground Storage Tanks · 2100 ft
- HAGER, JAMES M - ESTATE OFUnderground Storage Tanks · 2200 ft
- COLUMBIA BASIN ELECTRIC CO-OP INCUnderground Storage Tanks · 0.5 mi
- VERNS SPORTSUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Heppner'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 Heppner.
Total Sites
26
within ~10 miles of Heppner
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Heppner
Severity Distribution
within ~10 miles of Heppner
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Heppner, Underground Storage Tanks runs higher than the national average — 21 sites within ~10 miles of Heppner. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Heppner
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 Heppner average
Your land is one point inside Heppner
Everything above resolves to Heppner as a whole — one PHZM band and one 28°F frost record, read across 787 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 Heppner Average
Heppner Average
- ●USDA Zones 7a, averaged across Heppner
- ●One soil character for all of Heppner
- ●Frost dates read at Heppner's scale: Apr 13 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Heppner's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Heppner
Pull a site-specific report for your exact address in Heppner, Oregon — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Heppner averages can't show:
We read public map data around Heppner — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Heppner average
How we know this about Heppner
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 Heppner’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 Heppner
When does frost risk typically end in Heppner?
The last hard freeze (28°F) in Heppner typically lands around Apr 13, 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 4.
When is the first frost in Heppner?
The first hard freeze (28°F) in Heppner typically arrives around Oct 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 11, so the watching starts about Sep 25 — about 195 days after the spring freeze cleared.
How long is the growing season in Heppner?
Measured between 28°F hard freezes, Heppner sees about 195 frost-free days — roughly Apr 13 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 4 to Oct 11, about 160 days.
Is the soil safe to grow vegetables in Heppner?
The federal record around Heppner is light — 26 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (21), the nearest Underground Storage Tanks record about 0.3 miles 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 I protect my plants from frost in Heppner?
From about Sep 25 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Heppner's scale — its 7a band and its 195-day season. Your yard writes its own version of Heppner'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 Heppner’s own scale
6 of the readings below were taken at Heppner's own scale — its own ~195-day season between 28°F freezes, the 787 acres it covers and 26 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Heppner's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Heppner's own 28°F hard-freeze dates, about Apr 13 and Oct 25 and the ~195-day span between themNOAA 1991–2020 Climate Normals
- 26 documented contamination sites on the federal record near Heppner, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Heppner's boundary and the 787 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~195-day seasonGrowable Ground crop-matching engine
- The ecoregion at Heppner's own centroid, the Columbia PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Heppner's 787 acres read through its county's SSURGO summaryfrom Morrow County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Morrow 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 Morrow County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Heppner's 787 acreswhy one lot differs from the next →
- Which side of Heppner you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 787 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 Heppner-wide figureread your own land →
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