What USDA hardiness zone is Dubois County, Indiana?

Dubois County, Indiana spans USDA hardiness zones 6b to 7a. 89% of its ZIP codes are zone 6b, so there is no single zone for the county.

When is the last spring frost in Dubois County, Indiana?

The median last spring freeze runs April 6 – April 25 across the 5 NOAA weather stations serving Dubois County, Indiana, from NOAA 1991-2020 Climate Normals. Half of years freeze later than the median.

Indiana

Planting zones in Dubois County, Indiana

This county spans USDA zones 6b to 7a, so there is no single zone for Dubois County and anyone who gives you one is rounding. 89% of its ZIP codes are zone 6b; the rest are not.

USDA zones 6b–7a 2 zones across 9 ZIP codes

ZIP codes 9 9 have a NOAA station within range

Weather stations 5 NOAA 1991–2020 normals, across 427 sq mi

Your ZIP code

Get the exact answer for your address

Everything above describes Dubois County, Indiana as a whole. Hardiness zones and freeze dates are published per ZIP code, so yours is exact — enter it and this page will tell you your zone, which NOAA station it comes from and how far away that station is.

The growing season in Dubois County is closing

Nothing in the 32-crop table still has time to mature here. The first fall freeze normally arrives October 15 – November 1 across the 5 NOAA stations serving this county .

Your next season already has a date

The first job of it is 🧅 Green Onions, start indoors, around February 9 – February 28 — counted back from a last spring freeze of April 6 – April 25 here.

Every spring date for your ZIP →

These are ranges across the whole county. The ZIP lookup above gives the dates from your own nearest station instead.

All 5 stations agreeAt least one station

Every one of the 5 NOAA stations serving this county counts April 25 – October 15 as growing season (173 days). Widening to any single station gives April 6 – November 1 (209 days).

That is a 36-day difference inside one county — which is why this page gives ranges rather than a single planting date. The ZIP lookup above resolves it to one station.

Which zone you are in depends where you are

Dubois County covers 2 hardiness zones. A guide that gives the county one zone has picked whichever is largest and rounded everyone else into it — fine for the 89% in zone 6b and wrong for the other 11%. Here is the actual split.

Zone	ZIP codes	Share
6b	8	89%
7a	1	11%

Zones are published per ZIP code, so yours is exact even though the county's is not. The hardiness tool will tell you which one you are in.

Your freeze dates

Last spring freeze April 6 – April 25

First fall freeze October 15 – November 1

Across the 5 NOAA stations serving this county. These are medians — half of years freeze later than the date shown — so treat the later end of each range as the cautious one.

The growing season runs 172–206 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 84.2–89.5 °F in June–August. Summer rain over the same months runs 12.2–13.5" across those 4 stations, against the rough inch a week — about 13 inches over the same 92 days — that a vegetable garden is usually reckoned to want. At the middle station that is covered, so watering in Dubois County is for the gaps between storms rather than the whole season. The inches are NOAA's published normals; the inch a week is a rule of thumb, and it takes no account of a 86 °F summer afternoon drying the soil faster than a cool one.

Every ZIP code in Dubois County

Zones are published per ZIP code, not per county, so this is the exact answer rather than the county's average. The station column is the nearest one to that ZIP code's centroid and how far away it is — the same figure the tools use, shown here so you can see which ZIP codes are well covered and which are reaching.

ZIP code	USDA zone	Nearest NOAA station	Distance
47513	6b	Patoka Lake, IN	14.6 km
47521	6b	Patoka Lake, IN	3.4 km
47527	6b	Dubois S In Forage Fm, IN	7.8 km
47532	6b	Saint Meinrad, IN	7.6 km
47541	7a	Stendal, IN	10.9 km
47542	6b	Stendal, IN	17.4 km
47546	6b	Shoals 8 S, IN	19.2 km
47575	6b	Patoka Lake, IN	15.0 km
47580	6b	Patoka Lake, IN	10.5 km

ZIP-code positions are area centroids, so a large rural ZIP code's listed distance is measured from the middle of its area rather than from any particular address in it.

When to start seeds in Dubois County

Every date below is anchored on the last spring freeze at each station and reported as a range across all 5 of them, because no one station speaks for the county.

Crop	Job	When	Offset
🧅 Green Onions	Start indoors	February 9 – February 28	8 wk before
🌶️ Peppers	Start indoors	February 9 – February 28	8 wk before
🥦 Broccoli	Start indoors	February 23 – March 14	6 wk before
🥬 Cabbage	Start indoors	February 23 – March 14	6 wk before
🥬 Collards	Start indoors	February 23 – March 14	6 wk before
🥬 Kale	Start indoors	February 23 – March 14	6 wk before
🥬 Leaf Lettuce	Start indoors	February 23 – March 14	6 wk before
🫛 Peas	Direct sow	February 23 – March 14	6 wk before
🥬 Spinach	Direct sow	February 23 – March 14	6 wk before
🍠 Sweet Potato	Start indoors	February 23 – March 14	6 wk before
🍅 Tomatoes	Start indoors	February 23 – March 14	6 wk before
🥬 Bok Choy	Start indoors	March 2 – March 21	5 wk before
🥬 Kohlrabi	Start indoors	March 2 – March 21	5 wk before
🥬 Swiss Chard	Start indoors	March 2 – March 21	5 wk before
🥬 Arugula	Direct sow	March 9 – March 28	4 wk before
🥬 Baby Salad Greens	Direct sow	March 9 – March 28	4 wk before
🥕 Beets	Direct sow	March 9 – March 28	4 wk before
🧅 Green Onions	Direct sow	March 9 – March 28	4 wk before
🥬 Mustard Greens	Direct sow	March 9 – March 28	4 wk before
🌶️ Okra	Start indoors	March 9 – March 28	4 wk before
🌱 Radishes	Direct sow	March 9 – March 28	4 wk before
🥔 Turnips	Direct sow	March 9 – March 28	4 wk before
🥬 Cabbage	Set out	March 16 – April 4	3 wk before
🥕 Carrots	Direct sow	March 16 – April 4	3 wk before
🥬 Collards	Direct sow	March 16 – April 4	3 wk before
🥬 Collards	Set out	March 16 – April 4	3 wk before
🥒 Cucumbers	Start indoors	March 16 – April 4	3 wk before
🧅 Green Onions	Set out	March 16 – April 4	3 wk before
🥬 Kale	Direct sow	March 16 – April 4	3 wk before
🥬 Kale	Set out	March 16 – April 4	3 wk before
🥬 Kohlrabi	Direct sow	March 16 – April 4	3 wk before
🥬 Kohlrabi	Set out	March 16 – April 4	3 wk before
🥬 Leaf Lettuce	Direct sow	March 16 – April 4	3 wk before
🎃 Pumpkins	Start indoors	March 16 – April 4	3 wk before
🎃 Summer Squash	Start indoors	March 16 – April 4	3 wk before
🎃 Winter Squash	Start indoors	March 16 – April 4	3 wk before
🥒 Zucchini	Start indoors	March 16 – April 4	3 wk before
🥬 Bok Choy	Direct sow	March 23 – April 11	2 wk before
🥬 Bok Choy	Set out	March 23 – April 11	2 wk before
🥦 Broccoli	Set out	March 23 – April 11	2 wk before
🌿 Cilantro	Direct sow	March 23 – April 11	2 wk before
🥬 Leaf Lettuce	Set out	March 23 – April 11	2 wk before
🥬 Swiss Chard	Direct sow	March 23 – April 11	2 wk before
🥬 Swiss Chard	Set out	March 23 – April 11	2 wk before
🌿 Dill	Direct sow	March 30 – April 18	1 wk before
🫘 Bush Beans	Direct sow	April 13 – May 2	1 wk after
🥒 Cucumbers	Set out	April 13 – May 2	1 wk after
🎃 Pumpkins	Direct sow	April 13 – May 2	1 wk after
🎃 Pumpkins	Set out	April 13 – May 2	1 wk after
🎃 Summer Squash	Direct sow	April 13 – May 2	1 wk after
🎃 Summer Squash	Set out	April 13 – May 2	1 wk after
🌽 Sweet Corn	Direct sow	April 13 – May 2	1 wk after
🍅 Tomatoes	Set out	April 13 – May 2	1 wk after
🎃 Winter Squash	Direct sow	April 13 – May 2	1 wk after
🎃 Winter Squash	Set out	April 13 – May 2	1 wk after
🥒 Zucchini	Direct sow	April 13 – May 2	1 wk after
🥒 Zucchini	Set out	April 13 – May 2	1 wk after
🥒 Cucumbers	Direct sow	April 20 – May 9	2 wk after
🌶️ Okra	Direct sow	April 20 – May 9	2 wk after
🌶️ Okra	Set out	April 20 – May 9	2 wk after
🌶️ Peppers	Set out	April 20 – May 9	2 wk after
🫘 Southern Peas	Direct sow	April 20 – May 9	2 wk after
🍠 Sweet Potato	Set out	April 20 – May 9	2 wk after

Offsets are published guidance; the dates they land on are computed from measured NOAA normals. The seed-starting tool does this for your own ZIP code and counts the days.

What survives the winter changes across Dubois County

Zone 7a carries 58 of 74 perennial edibles; zone 6b carries 51. The best number is not always the warmest zone — the count peaks in the middle and falls both ways, because the warm end loses plants to insufficient winter chill and summer heat, not to cold.

Hardiness ranges are a judgement, published by growers rather than measured; the zone they are compared against is measured. On a warm-end verdict, check with your local extension service — a coastal zone 8 and an inland zone 8 are not the same summer.

Cautious — shortens the seasonMedian across stationsOptimistic

Last spring freeze: Plan to May 12 to be careful. Median April 6 – April 25 across 5 stations; March 21 is the optimistic end.
First fall freeze: Plan to October 3 to be careful. Median October 15 – November 1 across 5 stations; November 15 is the optimistic end.

NOAA publishes these as probabilities, not averages — the middle figure is a median, so half of years fall either side of it. The cautious end is the 10% tail: in roughly nine years in ten the freeze falls on the safe side of it.

The 5 stations behind these numbers

All 5 NOAA stations whose normals this page quotes, spanning about 43 km north to south. Every one is named with its identifier in the station list below — this page does not single one out, because no one station speaks for a whole county.

A relative sketch, not a map with a projection: longitude is adjusted for latitude so the shape is not stretched, and there is no basemap. For the one station nearest a specific address, with its real distance, use the ZIP lookup above.

These are the stations this county's ZIP codes actually cite as nearest — not a claim that each one sits inside its boundary, since a rural ZIP legitimately reaches over it. Every figure above comes from them, and each is named so you can check it.

Station	NOAA ID	Last spring freeze	First fall freeze	Season
Dubois S In Forage Fm, IN	USC00122309	April 25	October 15	172 days
Patoka Lake, IN	USC00126711	April 10	November 1	204 days
Saint Meinrad, IN	USC00127724	April 11	October 26	197 days
Shoals 8 S, IN	USC00128036	April 15	October 23	189 days
Stendal, IN	USC00128442	April 6	October 30	206 days

These are medians, not averages — NOAA publishes freeze dates as a probability distribution, and half of years freeze later than the date shown.

Your own ZIP

Work out your own dates

This page describes a whole county. Every tool below answers for one ZIP code, which is the grain the underlying data is published at.

Other places to compare

Dubois County sits in Indiana. That page carries the whole state's zone spread, its metro areas, and every other county in it with a page here.

More of Indiana

Counties with the same zones — 6b–7a

Matched on the exact zone set, not a dominant zone, so the winter answer on these pages really is the same one as here.

Gear

If you want to act on this

Each link opens an Amazon search rather than a product we picked. We have not tested these and do not rank them — the search is the honest version, and you choose.

Row cover and frost clothThe season here closes at the first fall freeze dated above — a cover buys back some of those days at the end.
MulchFor the perennials nearest their cold limit in zone 6b, where an insulated crown is what decides whether they come back.

As an Amazon Associate we earn from qualifying purchases. That costs you nothing extra, and it buys no influence over anything on this site: the dates come from NOAA normals and the zones from the USDA, and no product affects either.

Sources

Where these numbers come from

Hardiness zones are the USDA 2023 Plant Hardiness Zone Map, published per ZIP code by PRISM at Oregon State. Freeze dates and growing-season lengths are NOAA 1991–2020 Climate Normals, taken per station and cited above by name and NOAA ID.

County boundaries come from the Census ZCTA-to-county relation, which is what places each ZIP code — and which treats parishes, boroughs and census areas as county equivalents. No station is chosen to represent this county: every range above is taken across all of them and the count is stated, because picking one would be a judgement dressed as a measurement.