Mill Creek, Oklahoma, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, prickly pear, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Mill Creek, 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 Mill Creek 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 Mill Creek — soil, climate, flood, and parcel records. How we handle your address.
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Mill Creek — the short answer
Mill Creek, Oklahoma: USDA zone 7b, about 241 days between hard freezes, across 246 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~241
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 246 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 7b is Mill Creek's average, not your lot's — a low corner or a tree line moves it. Against Mill Creek's 241-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mill Creek
Each reading below is measured for Mill Creek itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMill Creek runs about 241 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
MeasuredMill Creek sits in USDA hardiness zone 7b.
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 Mill Creek is in
Mill Creek sits in the Cross Timbers — EPA Level III, inside the wider Great Plains. That is read at Mill Creek's own centroid rather than borrowed from Johnston County.
What Grows in Mill Creek
Every plant below cleared Mill Creek's own zone 7b and its 241-day season. Each card opens that plant's Oklahoma profile. How we score.
Is it too late to plant in Mill Creek?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 13 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Mill Creek
Closest first, within ~10 miles of Mill Creek. Listing isn't leaking, and distance isn't exposure.
- Mill Creek Snak ShakUnderground Storage Tanks · 600 ft
- B & B Self ServiceUnderground Storage Tanks · 1000 ft
- Mill Creek High SchoolUnderground Storage Tanks · 1600 ft
- 02S-05E-06 B 1Nitrate · 0.7 mi
- US SILICA CO/MILL CREEK SOUTH PLTBrownfields · 0.9 mi
- 02S-05E-08 ABB 1Nitrate · 1.4 mi
- MARTIN MARIETTA MATERIALS, INC.- MILL CREEKBrownfields · 2.1 mi
- 02S-04E-09 DAB 1Nitrate · 3.4 mi
- Unimin Corporation-Mill Creek PlantUnderground Storage Tanks · 4.6 mi
- 01S-05E-27 AAB 1Nitrate · 4.8 mi
- 02S-04E-28 DCB 1Nitrate · 5.1 mi
- US SILICA COMPANY-MILL CREEK NORTH PLANTBrownfields · 5.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Mill Creek'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 Mill Creek.
Total Sites
48
within ~10 miles of Mill Creek
Risk Level
Low
Highest-severity
1 concentrated animal feeding operation
Sources Checked
within ~10 miles of Mill Creek
Severity Distribution
within ~10 miles of Mill Creek
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mill Creek, Nitrate runs higher than the national average — 32 sites within ~10 miles of Mill Creek. 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.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Mill Creek
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 Mill Creek average
Your land is one point inside Mill Creek
Everything above resolves to Mill Creek as a whole — one PHZM band and one 28°F frost record, read across 246 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 Mill Creek Average
Mill Creek Average
- ●USDA Zones 7b, averaged across Mill Creek
- ●One soil character for all of Mill Creek
- ●Frost dates read at Mill Creek's scale: Mar 17 to Nov 13
YOUR Parcel
- ✓Your exact zone, not Mill Creek's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mill Creek
Pull a site-specific report for your exact address in Mill Creek, Oklahoma — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mill Creek averages can't show:
We read public map data around Mill Creek — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mill Creek average
How we know this about Mill Creek
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 Mill Creek’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 Mill Creek
When does frost risk typically end in Mill Creek?
The last hard freeze (28°F) in Mill Creek typically lands around Mar 17, 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 7.
When is the first frost in Mill Creek?
The first hard freeze (28°F) in Mill Creek typically arrives around Nov 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 30, so the watching starts about Oct 14 — about 241 days after the spring freeze cleared.
How long is the growing season in Mill Creek?
Measured between 28°F hard freezes, Mill Creek sees about 241 frost-free days — roughly Mar 17 through Nov 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 7 to Oct 30, about 206 days.
Is the soil safe to grow vegetables in Mill Creek?
The federal record around Mill Creek is light — 48 documented sites across the 9 federal source types we checked, mostly Nitrate entries (32), the nearest Underground Storage Tanks record about 0.1 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 Mill Creek?
From about Oct 14 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 Nov 13 (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 Nov 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mill Creek's scale — its 7b band and its 241-day season. Your yard writes its own version of Mill Creek'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 Mill Creek’s own scale
6 of the readings below were taken at Mill Creek's own scale — its own ~241-day season between 28°F freezes, the 246 acres it covers and 48 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mill Creek's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Mill Creek's own 28°F hard-freeze dates, about Mar 17 and Nov 13 and the ~241-day span between themNOAA 1991–2020 Climate Normals
- 48 documented contamination sites on the federal record near Mill Creek, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Mill Creek's boundary and the 246 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~241-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mill Creek's own centroid, the Cross TimbersUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mill Creek's 246 acres read through its county's SSURGO summaryfrom Johnston County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Johnston County
- The growing challenges every Oklahoma grower plans around — written at state scale, so they stay on the state guidefrom Oklahoma
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Johnston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mill Creek's 246 acreswhy one lot differs from the next →
- Which side of Mill Creek you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 246 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Mill Creek-wide figureread your own land →
More in Oklahoma
Wider growing context
What grows across OklahomaMill Creek sits outside our named growing regions, so Oklahoma as a whole is its closest context here.
Nearby growing guides