What USDA hardiness zone is Spencer County, Indiana?

Spencer County, Indiana spans USDA hardiness zones 6b to 7a. 91% of its ZIP codes are zone 7a, so there is no single zone for the county.

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

The median last spring freeze runs April 5 – April 12 across the 4 NOAA weather stations serving Spencer County, Indiana, from NOAA 1991-2020 Climate Normals. Half of years freeze later than the median.

Indiana

Planting zones in Spencer County, Indiana

This county spans USDA zones 6b to 7a, so there is no single zone for Spencer County and anyone who gives you one is rounding. 91% of its ZIP codes are zone 7a; the rest are not.

USDA zones 6b–7a 2 zones across 11 ZIP codes

ZIP codes 11 11 have a NOAA station within range

Weather stations 4 NOAA 1991–2020 normals, across 397 sq mi

Your ZIP code

Get the exact answer for your address

Everything above describes Spencer 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 Spencer County is closing

Nothing in the 32-crop table still has time to mature here. The first fall freeze normally arrives October 25 – November 1 across the 4 NOAA stations serving this county .

Your next season already has a date

The first job of it is 🧅 Green Onions, start indoors, around February 8 – February 15 — counted back from a last spring freeze of April 5 – April 12 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 4 stations agreeAt least one station

Every one of the 4 NOAA stations serving this county counts April 12 – October 25 as growing season (196 days). Widening to any single station gives April 5 – November 1 (210 days).

Which zone you are in depends where you are

Spencer 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 91% in zone 7a and wrong for the other 9%. Here is the actual split.

Zone	ZIP codes	Share
7a	10	91%
6b	1	9%

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 5 – April 12

First fall freeze October 25 – November 1

Across the 4 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 196–208 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 84.1–87.5 °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. The middle station covers about 95% of it, so expect to make up the rest. 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 Spencer 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
47531	7a	Tell City, IN	11.7 km
47537	7a	Stendal, IN	19.2 km
47550	7a	Saint Meinrad, IN	14.6 km
47552	7a	Saint Meinrad, IN	17.2 km
47577	6b	Saint Meinrad, IN	1.6 km
47579	7a	Saint Meinrad, IN	10.9 km
47588	7a	Tell City, IN	8.8 km
47611	7a	Boonville 1S, IN	18.9 km
47615	7a	Tell City, IN	15.7 km
47634	7a	Boonville 1S, IN	12.9 km
47635	7a	Boonville 1S, IN	22.3 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 Spencer County

Every date below is anchored on the last spring freeze at each station and reported as a range across all 4 of them, because no one station speaks for the county.

Crop	Job	When	Offset
🧅 Green Onions	Start indoors	February 8 – February 15	8 wk before
🌶️ Peppers	Start indoors	February 8 – February 15	8 wk before
🥦 Broccoli	Start indoors	February 22 – March 1	6 wk before
🥬 Cabbage	Start indoors	February 22 – March 1	6 wk before
🥬 Collards	Start indoors	February 22 – March 1	6 wk before
🥬 Kale	Start indoors	February 22 – March 1	6 wk before
🥬 Leaf Lettuce	Start indoors	February 22 – March 1	6 wk before
🫛 Peas	Direct sow	February 22 – March 1	6 wk before
🥬 Spinach	Direct sow	February 22 – March 1	6 wk before
🍠 Sweet Potato	Start indoors	February 22 – March 1	6 wk before
🍅 Tomatoes	Start indoors	February 22 – March 1	6 wk before
🥬 Bok Choy	Start indoors	March 1 – March 8	5 wk before
🥬 Kohlrabi	Start indoors	March 1 – March 8	5 wk before
🥬 Swiss Chard	Start indoors	March 1 – March 8	5 wk before
🥬 Arugula	Direct sow	March 8 – March 15	4 wk before
🥬 Baby Salad Greens	Direct sow	March 8 – March 15	4 wk before
🥕 Beets	Direct sow	March 8 – March 15	4 wk before
🧅 Green Onions	Direct sow	March 8 – March 15	4 wk before
🥬 Mustard Greens	Direct sow	March 8 – March 15	4 wk before
🌶️ Okra	Start indoors	March 8 – March 15	4 wk before
🌱 Radishes	Direct sow	March 8 – March 15	4 wk before
🥔 Turnips	Direct sow	March 8 – March 15	4 wk before
🥬 Cabbage	Set out	March 15 – March 22	3 wk before
🥕 Carrots	Direct sow	March 15 – March 22	3 wk before
🥬 Collards	Direct sow	March 15 – March 22	3 wk before
🥬 Collards	Set out	March 15 – March 22	3 wk before
🥒 Cucumbers	Start indoors	March 15 – March 22	3 wk before
🧅 Green Onions	Set out	March 15 – March 22	3 wk before
🥬 Kale	Direct sow	March 15 – March 22	3 wk before
🥬 Kale	Set out	March 15 – March 22	3 wk before
🥬 Kohlrabi	Direct sow	March 15 – March 22	3 wk before
🥬 Kohlrabi	Set out	March 15 – March 22	3 wk before
🥬 Leaf Lettuce	Direct sow	March 15 – March 22	3 wk before
🎃 Pumpkins	Start indoors	March 15 – March 22	3 wk before
🎃 Summer Squash	Start indoors	March 15 – March 22	3 wk before
🎃 Winter Squash	Start indoors	March 15 – March 22	3 wk before
🥒 Zucchini	Start indoors	March 15 – March 22	3 wk before
🥬 Bok Choy	Direct sow	March 22 – March 29	2 wk before
🥬 Bok Choy	Set out	March 22 – March 29	2 wk before
🥦 Broccoli	Set out	March 22 – March 29	2 wk before
🌿 Cilantro	Direct sow	March 22 – March 29	2 wk before
🥬 Leaf Lettuce	Set out	March 22 – March 29	2 wk before
🥬 Swiss Chard	Direct sow	March 22 – March 29	2 wk before
🥬 Swiss Chard	Set out	March 22 – March 29	2 wk before
🌿 Dill	Direct sow	March 29 – April 5	1 wk before
🫘 Bush Beans	Direct sow	April 12 – April 19	1 wk after
🥒 Cucumbers	Set out	April 12 – April 19	1 wk after
🎃 Pumpkins	Direct sow	April 12 – April 19	1 wk after
🎃 Pumpkins	Set out	April 12 – April 19	1 wk after
🎃 Summer Squash	Direct sow	April 12 – April 19	1 wk after
🎃 Summer Squash	Set out	April 12 – April 19	1 wk after
🌽 Sweet Corn	Direct sow	April 12 – April 19	1 wk after
🍅 Tomatoes	Set out	April 12 – April 19	1 wk after
🎃 Winter Squash	Direct sow	April 12 – April 19	1 wk after
🎃 Winter Squash	Set out	April 12 – April 19	1 wk after
🥒 Zucchini	Direct sow	April 12 – April 19	1 wk after
🥒 Zucchini	Set out	April 12 – April 19	1 wk after
🥒 Cucumbers	Direct sow	April 19 – April 26	2 wk after
🌶️ Okra	Direct sow	April 19 – April 26	2 wk after
🌶️ Okra	Set out	April 19 – April 26	2 wk after
🌶️ Peppers	Set out	April 19 – April 26	2 wk after
🫘 Southern Peas	Direct sow	April 19 – April 26	2 wk after
🍠 Sweet Potato	Set out	April 19 – April 26	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 Spencer 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 April 30 to be careful. Median April 5 – April 12 across 4 stations; March 20 is the optimistic end.
First fall freeze: Plan to October 12 to be careful. Median October 25 – November 1 across 4 stations; November 18 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 4 stations behind these numbers

All 4 NOAA stations whose normals this page quotes, spanning about 35 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
Boonville 1S, IN	USC00120852	April 12	October 25	196 days
Saint Meinrad, IN	USC00127724	April 11	October 26	197 days
Stendal, IN	USC00128442	April 6	October 30	206 days
Tell City, IN	USC00128698	April 5	November 1	208 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

Spencer 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.