Ortley, South Dakota, sits in USDA hardiness zone 4b — a zone band wide enough that plant choice, not possibility, is the interesting question.
These conditions suit cabbage, cranberry, turkish rocket, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Ortley, 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 Ortley 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 Ortley — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Ortley — the short answer
Ortley, South Dakota: USDA zone 4b, about 167 days between hard freezes, across 1K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~167
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town 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 4b is Ortley's average, not your lot's — a low corner or a tree line moves it. Against Ortley's 167-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ortley
Each reading below is measured for Ortley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOrtley runs about 167 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
MeasuredOrtley sits in USDA hardiness zone 4b.
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 Ortley is in
Ortley sits in the Northern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Ortley's own centroid rather than borrowed from Roberts County.
What Grows in Ortley
Every plant below cleared Ortley's own zone 4b and its 167-day season. Each card opens that plant's South Dakota profile. How we score.
Is it too late to plant in Ortley?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Apr 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 13 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Ortley
Closest first, within ~10 miles of Ortley. Listing isn't leaking, and distance isn't exposure.
- GUDERIAN GARAGEUnderground Storage Tanks · 2400 ft
- 122N52W29B RNitrate · 0.9 mi
- 122N53W25AABB3 RNitrate · 1.4 mi
- 122N52W16BBBC R (SISSETON GW WELL RB-82B)Nitrate · 1.6 mi
- 122N53W24CDCA RNitrate · 1.8 mi
- 122N52W32AAAA RNitrate · 1.9 mi
- 122N52W27BBBB2 RNitrate · 2.0 mi
- 122N52W 7ACBB RNitrate · 2.2 mi
- 122N52W 5CCCC RNitrate · 2.5 mi
- 122N53W11DDDD RNitrate · 2.5 mi
- 122N53W12AAAB2 RNitrate · 2.6 mi
- 122N52W 5CBCD RNitrate · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Ortley'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 Ortley.
Sources Checked
within ~10 miles of Ortley
Severity Distribution
within ~10 miles of Ortley
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Ortley, Nitrate runs higher than the national average — 142 sites within ~10 miles of Ortley. That's not a problem with your land — it's information about 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 Ortley
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 Ortley average
Your land is one point inside Ortley
Everything above resolves to Ortley 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 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 Ortley Average
Ortley Average
- ●USDA Zones 4b, averaged across Ortley
- ●One soil character for all of Ortley
- ●Frost dates read at Ortley's scale: Apr 29 to Oct 13
YOUR Parcel
- ✓Your exact zone, not Ortley's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ortley
Pull a site-specific report for your exact address in Ortley, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ortley averages can't show:
We read public map data around Ortley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ortley average
How we know this about Ortley
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 Ortley’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 Ortley
When does frost risk typically end in Ortley?
The last hard freeze (28°F) in Ortley typically lands around Apr 29, 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 20.
When is the first frost in Ortley?
The first hard freeze (28°F) in Ortley typically arrives around Oct 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 29, so the watching starts about Sep 13 — about 167 days after the spring freeze cleared.
How long is the growing season in Ortley?
Measured between 28°F hard freezes, Ortley sees about 167 frost-free days — roughly Apr 29 through Oct 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 20 to Sep 29, about 132 days.
Is the soil safe to grow vegetables in Ortley?
The federal record around Ortley shows 156 documented sites, mostly Nitrate entries (142), the nearest Underground Storage Tanks record about 0.4 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Ortley?
From about Sep 13 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 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 Oct 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ortley's scale — its 4b band and its 167-day season. Your yard writes its own version of Ortley'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 Ortley’s own scale
6 of the readings below were taken at Ortley's own scale — its own ~167-day season between 28°F freezes, the 1,436 acres it covers and 156 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Ortley's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Ortley's own 28°F hard-freeze dates, about Apr 29 and Oct 13 and the ~167-day span between themNOAA 1991–2020 Climate Normals
- 156 documented contamination sites on the federal record near Ortley, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Ortley's boundary and the 1,436 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~167-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ortley's own centroid, the Northern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Ortley's 1,436 acres read through its county's SSURGO summaryfrom Roberts County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Roberts County
- The growing challenges every South Dakota grower plans around — written at state scale, so they stay on the state guidefrom South Dakota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Roberts County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ortley's 1,436 acreswhy one lot differs from the next →
- Which side of Ortley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,436 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Ortley-wide figureread your own land →