What USDA hardiness zone is Jackson County, Oklahoma?

Every ZIP code in Jackson County, Oklahoma is USDA hardiness zone 7b, from the USDA 2023 Plant Hardiness Zone Map.

When is the last spring frost in Jackson County, Oklahoma?

The median last spring freeze runs April 2 – April 10 across the 7 NOAA weather stations serving Jackson County, Oklahoma, from NOAA 1991-2020 Climate Normals. Half of years freeze later than the median.

Oklahoma

Planting zones in Jackson County, Oklahoma

Every ZIP code in this county is USDA zone 7b — so unlike most of the places people look up, there is one right answer here and it holds wherever you are in the county.

USDA zone 7b The same in all 9 ZIP codes

ZIP codes 9 9 have a NOAA station within range

Weather stations 7 NOAA 1991–2020 normals, across 803 sq mi

Your ZIP code

Get the exact answer for your address

Everything above describes Jackson County, Oklahoma 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 Jackson County is closing

Nothing in the 32-crop table still has time to mature here. The first fall freeze normally arrives October 28 – November 6 across the 7 NOAA stations serving this county .

Your next season already has a date

The first job of it is 🧅 Green Onions, start indoors, around February 5 – February 13 — counted back from a last spring freeze of April 2 – April 10 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 7 stations agreeAt least one station

Every one of the 7 NOAA stations serving this county counts April 10 – October 28 as growing season (201 days). Widening to any single station gives April 2 – November 6 (218 days).

Your freeze dates

Last spring freeze April 2 – April 10

First fall freeze October 28 – November 6

Across the 7 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 200–217 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 93–95.2 °F in June–August. That is past the point where tomato and pepper pollen fails and cool-season greens bolt, so in this county heat decides as much as frost does. Summer rain over the same months runs 8.6–10.0" across those 6 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 71% 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 95 °F summer afternoon drying the soil faster than a cool one.

Every ZIP code in Jackson 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
73521	7b	Altus Irig Rsch Stn, OK	5.2 km
73523	7b	Altus Irig Rsch Stn, OK	8.5 km
73526	7b	Altus Dam, OK	10.6 km
73532	7b	Hollis 5E, OK	21.3 km
73537	7b	Quanah 2 SW, TX	22.6 km
73539	7b	Tipton 4S Mesonet, OK	13.3 km
73549	7b	Altus Irig Rsch Stn, OK	17.7 km
73556	7b	Mangum 5Se Mesonet, OK	12.7 km
73560	7b	Altus 3S Mesonet, OK	11.1 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 Jackson County

Every date below is anchored on the last spring freeze at each station and reported as a range across all 7 of them, because no one station speaks for the county.

Crop	Job	When	Offset
🧅 Green Onions	Start indoors	February 5 – February 13	8 wk before
🌶️ Peppers	Start indoors	February 5 – February 13	8 wk before
🥦 Broccoli	Start indoors	February 19 – February 27	6 wk before
🥬 Cabbage	Start indoors	February 19 – February 27	6 wk before
🥬 Collards	Start indoors	February 19 – February 27	6 wk before
🥬 Kale	Start indoors	February 19 – February 27	6 wk before
🥬 Leaf Lettuce	Start indoors	February 19 – February 27	6 wk before
🫛 Peas	Direct sow	February 19 – February 27	6 wk before
🥬 Spinach	Direct sow	February 19 – February 27	6 wk before
🍠 Sweet Potato	Start indoors	February 19 – February 27	6 wk before
🍅 Tomatoes	Start indoors	February 19 – February 27	6 wk before
🥬 Bok Choy	Start indoors	February 26 – March 6	5 wk before
🥬 Kohlrabi	Start indoors	February 26 – March 6	5 wk before
🥬 Swiss Chard	Start indoors	February 26 – March 6	5 wk before
🥬 Arugula	Direct sow	March 5 – March 13	4 wk before
🥬 Baby Salad Greens	Direct sow	March 5 – March 13	4 wk before
🥕 Beets	Direct sow	March 5 – March 13	4 wk before
🧅 Green Onions	Direct sow	March 5 – March 13	4 wk before
🥬 Mustard Greens	Direct sow	March 5 – March 13	4 wk before
🌶️ Okra	Start indoors	March 5 – March 13	4 wk before
🌱 Radishes	Direct sow	March 5 – March 13	4 wk before
🥔 Turnips	Direct sow	March 5 – March 13	4 wk before
🥬 Cabbage	Set out	March 12 – March 20	3 wk before
🥕 Carrots	Direct sow	March 12 – March 20	3 wk before
🥬 Collards	Direct sow	March 12 – March 20	3 wk before
🥬 Collards	Set out	March 12 – March 20	3 wk before
🥒 Cucumbers	Start indoors	March 12 – March 20	3 wk before
🧅 Green Onions	Set out	March 12 – March 20	3 wk before
🥬 Kale	Direct sow	March 12 – March 20	3 wk before
🥬 Kale	Set out	March 12 – March 20	3 wk before
🥬 Kohlrabi	Direct sow	March 12 – March 20	3 wk before
🥬 Kohlrabi	Set out	March 12 – March 20	3 wk before
🥬 Leaf Lettuce	Direct sow	March 12 – March 20	3 wk before
🎃 Pumpkins	Start indoors	March 12 – March 20	3 wk before
🎃 Summer Squash	Start indoors	March 12 – March 20	3 wk before
🎃 Winter Squash	Start indoors	March 12 – March 20	3 wk before
🥒 Zucchini	Start indoors	March 12 – March 20	3 wk before
🥬 Bok Choy	Direct sow	March 19 – March 27	2 wk before
🥬 Bok Choy	Set out	March 19 – March 27	2 wk before
🥦 Broccoli	Set out	March 19 – March 27	2 wk before
🌿 Cilantro	Direct sow	March 19 – March 27	2 wk before
🥬 Leaf Lettuce	Set out	March 19 – March 27	2 wk before
🥬 Swiss Chard	Direct sow	March 19 – March 27	2 wk before
🥬 Swiss Chard	Set out	March 19 – March 27	2 wk before
🌿 Dill	Direct sow	March 26 – April 3	1 wk before
🫘 Bush Beans	Direct sow	April 9 – April 17	1 wk after
🥒 Cucumbers	Set out	April 9 – April 17	1 wk after
🎃 Pumpkins	Direct sow	April 9 – April 17	1 wk after
🎃 Pumpkins	Set out	April 9 – April 17	1 wk after
🎃 Summer Squash	Direct sow	April 9 – April 17	1 wk after
🎃 Summer Squash	Set out	April 9 – April 17	1 wk after
🌽 Sweet Corn	Direct sow	April 9 – April 17	1 wk after
🍅 Tomatoes	Set out	April 9 – April 17	1 wk after
🎃 Winter Squash	Direct sow	April 9 – April 17	1 wk after
🎃 Winter Squash	Set out	April 9 – April 17	1 wk after
🥒 Zucchini	Direct sow	April 9 – April 17	1 wk after
🥒 Zucchini	Set out	April 9 – April 17	1 wk after
🥒 Cucumbers	Direct sow	April 16 – April 24	2 wk after
🌶️ Okra	Direct sow	April 16 – April 24	2 wk after
🌶️ Okra	Set out	April 16 – April 24	2 wk after
🌶️ Peppers	Set out	April 16 – April 24	2 wk after
🫘 Southern Peas	Direct sow	April 16 – April 24	2 wk after
🍠 Sweet Potato	Set out	April 16 – April 24	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 lives through a zone 7b winter

Of 74 perennial edibles, 56 come through a zone 7b winter — and 3 fail here for being too warm rather than too cold, needing more winter chill than this county gets or more heat than they tolerate. Among the ones that work: Apple, Aronia, Black Currant, Elderberry, Gooseberry, Summer Raspberry, Asparagus, Horseradish.

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 27 to be careful. Median April 2 – April 10 across 7 stations; March 11 is the optimistic end.
First fall freeze: Plan to October 15 to be careful. Median October 28 – November 6 across 7 stations; November 21 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 7 stations behind these numbers

All 7 NOAA stations whose normals this page quotes, spanning about 68 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
Altus 3S Mesonet, OK	USC00340180	April 3	November 4	214 days
Altus Dam, OK	USC00340184	April 2	November 3	213 days
Altus Irig Rsch Stn, OK	USC00340179	April 5	November 2	210 days
Hollis 5E, OK	USC00344249	April 10	October 28	200 days
Mangum 5Se Mesonet, OK	USC00345514	April 10	October 29	201 days
Quanah 2 SW, TX	USC00417336	April 4	November 1	210 days
Tipton 4S Mesonet, OK	USC00348879	April 3	November 6	217 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

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

More of Oklahoma

Counties with the same zones — 7b

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.

Shade clothSummer highs here average 95 °F, at or above the 90 °F point where lettuce and spinach bolt and tomato pollen fails.
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 7b, 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.