Egan, South Dakota, sits in USDA hardiness zone 4b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Among the crops suited to this profile: cabbage, cranberry, turkish rocket, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Egan, 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 Egan 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 Egan — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Egan — the short answer
Egan, South Dakota: USDA zone 4b, about 168 days between hard freezes, across 683 acres of city.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 24
- 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
- ~168
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 683 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 Egan's average, not your lot's — a low corner or a tree line moves it. Against Egan's 168-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Egan
Each reading below is measured for Egan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredEgan runs about 168 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
MeasuredEgan 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 Egan is in
Egan sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Egan's own centroid, and it is not what its county reads: Moody County is mostly Northern Glaciated Plains. The wider page above you is answering a different question about different ground.
What Grows in Egan
Every plant below cleared Egan's own zone 4b and its 168-day season. Each card opens that plant's South Dakota profile. How we score.
Is it too late to plant in Egan?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 24 (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. 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 Egan
Closest first, within ~10 miles of Egan. Listing isn't leaking, and distance isn't exposure.
- MAY CONSTRUCTIONBrownfields · 1100 ft
- EGAN GARAGEUnderground Storage Tanks · 1600 ft
- BLUE JAYSUnderground Storage Tanks · 1800 ft
- 106N48W07CBBBNitrate · 2200 ft
- 106N48W07DAANitrate · 0.7 mi
- 106N48W07DDANitrate · 0.8 mi
- 106N48W07DDDNitrate · 0.8 mi
- 106N48W07DDDD2Nitrate · 0.9 mi
- 106N48W05CCCCNitrate · 1.1 mi
- 106N49W15DDDDNitrate · 2.5 mi
- 107N48W30CCC (3)Nitrate · 2.6 mi
- 106N49W25BBBNitrate · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Egan'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 Egan.
Total Sites
120
within ~10 miles of Egan
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Egan
Severity Distribution
within ~10 miles of Egan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Egan, two things run higher than the national average within ~10 miles of Egan — CAFO (4 sites) and Nitrate (80 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Egan
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 Egan average
Your land is one point inside Egan
Everything above resolves to Egan as a whole — one PHZM band and one 28°F frost record, read across 683 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 Egan Average
Egan Average
- ●USDA Zones 4b, averaged across Egan
- ●One soil character for all of Egan
- ●Frost dates read at Egan's scale: Apr 24 to Oct 9
YOUR Parcel
- ✓Your exact zone, not Egan's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Egan
Pull a site-specific report for your exact address in Egan, South Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Egan averages can't show:
We read public map data around Egan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Egan average
How we know this about Egan
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 Egan’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 Egan
When does frost risk typically end in Egan?
The last hard freeze (28°F) in Egan typically lands around Apr 24, 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 15.
When is the first frost in Egan?
The first hard freeze (28°F) in Egan 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 168 days after the spring freeze cleared.
How long is the growing season in Egan?
Measured between 28°F hard freezes, Egan sees about 168 frost-free days — roughly Apr 24 through Oct 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 15 to Sep 25, about 133 days.
Is the soil safe to grow vegetables in Egan?
The federal record around Egan shows 120 documented sites, mostly Nitrate entries (80), the nearest Brownfields record about 0.2 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 Egan?
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 Egan's scale — its 4b band and its 168-day season. Your yard writes its own version of Egan'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 Egan’s own scale
6 of the readings below were taken at Egan's own scale — its own ~168-day season between 28°F freezes, the 683 acres it covers and 120 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Egan's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Egan's own 28°F hard-freeze dates, about Apr 24 and Oct 9 and the ~168-day span between themNOAA 1991–2020 Climate Normals
- 120 documented contamination sites on the federal record near Egan, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Egan's boundary and the 683 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~168-day seasonGrowable Ground crop-matching engine
- Egan sits in the Western Corn Belt Plains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Egan's 683 acres read through its county's SSURGO summaryfrom Moody County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Moody 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 Moody County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Egan's 683 acreswhy one lot differs from the next →
- Which side of Egan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 683 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Egan-wide figureread your own land →
More in South Dakota
Wider growing context
What grows across South DakotaEgan sits outside our named growing regions, so South Dakota as a whole is its closest context here.
Nearby growing guides