Oxford, Idaho, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
A short list that earns its place here — cabbage, cranberry, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Oxford, 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 Oxford 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 Oxford — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Oxford — the short answer
Oxford, Idaho: USDA zone 5b, about 162 days between hard freezes, across 167 acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~162
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 167 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 5b is Oxford's average, not your lot's — a low corner or a tree line moves it. Against Oxford's 162-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Oxford
Each reading below is measured for Oxford itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOxford runs about 162 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
MeasuredOxford sits in USDA hardiness zone 5b.
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 Oxford is in
Oxford sits in the Central Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Oxford's own centroid, and it is not what its county reads: Franklin County is mostly Northern Basin and Range. The wider page above you is answering a different question about different ground.
What Grows in Oxford
Every plant below cleared Oxford's own zone 5b and its 162-day season. Each card opens that plant's Idaho profile. How we score.
Is it too late to plant in Oxford?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 9 — 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 Oxford
Closest first, within ~10 miles of Oxford. Listing isn't leaking, and distance isn't exposure.
- 13S 38E 17DD 1Nitrate · 2.0 mi
- Hatch ProspectMining · 2.3 mi
- 13S 38E 10BCA1Nitrate · 2.8 mi
- Lucky Baker ProspectMining · 3.6 mi
- THOMAS MERCHANTSUnderground Storage Tanks · 3.8 mi
- SWANLAKE STATIONUnderground Storage Tanks · 3.9 mi
- OXFORD STATIONUnderground Storage Tanks · 3.9 mi
- 13S 38E 03CBD1Nitrate · 4.1 mi
- 13S 38E 03DDA1Nitrate · 4.3 mi
- 14S 38E 22ABA1Nitrate · 4.3 mi
- 14S 38E 22BDD1Nitrate · 4.7 mi
- 14S 38E 22CCB1Nitrate · 5.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Oxford'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 Oxford.
Total Sites
34
within ~10 miles of Oxford
Risk Level
Low
Highest-severity
3 mining sites (prospects, none worked)
Sources Checked
within ~10 miles of Oxford
Severity Distribution
within ~10 miles of Oxford
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Oxford, two things run higher than the national average within ~10 miles of Oxford — Nitrate (26 sites) and Mining (3 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
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 well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Oxford
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 Oxford average
Your land is one point inside Oxford
Everything above resolves to Oxford as a whole — one PHZM band and one 28°F frost record, read across 167 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 Oxford Average
Oxford Average
- ●USDA Zones 5b, averaged across Oxford
- ●One soil character for all of Oxford
- ●Frost dates read at Oxford's scale: Apr 30 to Oct 9
YOUR Parcel
- ✓Your exact zone, not Oxford's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Oxford
Pull a site-specific report for your exact address in Oxford, Idaho — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Oxford averages can't show:
We read public map data around Oxford — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Oxford average
How we know this about Oxford
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 Oxford’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 Oxford
When does frost risk typically end in Oxford?
The last hard freeze (28°F) in Oxford typically lands around Apr 30, 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 21.
When is the first frost in Oxford?
The first hard freeze (28°F) in Oxford typically arrives around Oct 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 25, so the watching starts about Sep 9 — about 162 days after the spring freeze cleared.
How long is the growing season in Oxford?
Measured between 28°F hard freezes, Oxford sees about 162 frost-free days — roughly Apr 30 through Oct 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Sep 25, about 127 days.
Is the soil safe to grow vegetables in Oxford?
The federal record around Oxford is light — 34 documented sites across the 9 federal source types we checked, mostly Nitrate entries (26), the nearest Nitrate record about 2.0 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 Oxford?
From about Sep 9 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Oxford's scale — its 5b band and its 162-day season. Your yard writes its own version of Oxford'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 Oxford’s own scale
6 of the readings below were taken at Oxford's own scale — its own ~162-day season between 28°F freezes, the 167 acres it covers and 34 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Oxford's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Oxford's own 28°F hard-freeze dates, about Apr 30 and Oct 9 and the ~162-day span between themNOAA 1991–2020 Climate Normals
- 34 documented contamination sites on the federal record near Oxford, the closest Nitrate record about 2.0 miles out from the town centreFederal environmental registers
- Oxford's boundary and the 167 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~162-day seasonGrowable Ground crop-matching engine
- Oxford sits in the Central Basin and Range — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Oxford's 167 acres read through its county's SSURGO summaryfrom Franklin County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Franklin County
- The growing challenges every Idaho grower plans around — written at state scale, so they stay on the state guidefrom Idaho
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Franklin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Oxford's 167 acreswhy one lot differs from the next →
- Which side of Oxford you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 167 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 2.0 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 Oxford-wide figureread your own land →
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