What USDA hardiness zone is Cass County, Texas?

Every ZIP code in Cass County, Texas is USDA hardiness zone 8b, from the USDA 2023 Plant Hardiness Zone Map.

When is the last spring frost in Cass County, Texas?

The median last spring freeze runs March 4 – March 26 across the 5 NOAA weather stations serving Cass County, Texas, from NOAA 1991-2020 Climate Normals. Half of years freeze later than the median.

Texas

Planting zones in Cass County, Texas

Every ZIP code in this county is USDA zone 8b — 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 8b The same in all 13 ZIP codes

ZIP codes 13 13 have a NOAA station within range

Weather stations 5 NOAA 1991–2020 normals, across 937 sq mi

Your ZIP code

Get the exact answer for your address

Everything above describes Cass County, Texas 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 Cass County is closing

Nothing in the 32-crop table still has time to mature here. The first fall freeze normally arrives November 6 – November 22 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 January 7 – January 29 — counted back from a last spring freeze of March 4 – March 26 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 March 26 – November 6 as growing season (225 days). Widening to any single station gives March 4 – November 22 (263 days).

That is a 38-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.

Your freeze dates

Last spring freeze March 4 – March 26

First fall freeze November 6 – November 22

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 225–261 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 90.9–93.2 °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 9.6–11.2" across those 5 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 78% 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 92 °F summer afternoon drying the soil faster than a cool one.

Every ZIP code in Cass 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
75551	8b	Atlanta, TX	5.1 km
75555	8b	Atlanta, TX	20.7 km
75556	8b	Atlanta, TX	10.2 km
75560	8b	Atlanta, TX	20.5 km
75562	8b	Jefferson, TX	21.0 km
75563	8b	Atlanta, TX	23.7 km
75564	8b	Jefferson, TX	16.7 km
75565	8b	Atlanta, TX	21.2 km
75566	8b	Atlanta, TX	30.3 km
75568	8b	Dekalb, TX	32.0 km
75572	8b	Wright Patman Dm & Lk, TX	9.1 km
75630	8b	Daingerfield 9 S, TX	15.9 km
75656	8b	Daingerfield 9 S, TX	17.3 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 Cass 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	January 7 – January 29	8 wk before
🌶️ Peppers	Start indoors	January 7 – January 29	8 wk before
🥦 Broccoli	Start indoors	January 21 – February 12	6 wk before
🥬 Cabbage	Start indoors	January 21 – February 12	6 wk before
🥬 Collards	Start indoors	January 21 – February 12	6 wk before
🥬 Kale	Start indoors	January 21 – February 12	6 wk before
🥬 Leaf Lettuce	Start indoors	January 21 – February 12	6 wk before
🫛 Peas	Direct sow	January 21 – February 12	6 wk before
🥬 Spinach	Direct sow	January 21 – February 12	6 wk before
🍠 Sweet Potato	Start indoors	January 21 – February 12	6 wk before
🍅 Tomatoes	Start indoors	January 21 – February 12	6 wk before
🥬 Bok Choy	Start indoors	January 28 – February 19	5 wk before
🥬 Kohlrabi	Start indoors	January 28 – February 19	5 wk before
🥬 Swiss Chard	Start indoors	January 28 – February 19	5 wk before
🥬 Arugula	Direct sow	February 4 – February 26	4 wk before
🥬 Baby Salad Greens	Direct sow	February 4 – February 26	4 wk before
🥕 Beets	Direct sow	February 4 – February 26	4 wk before
🧅 Green Onions	Direct sow	February 4 – February 26	4 wk before
🥬 Mustard Greens	Direct sow	February 4 – February 26	4 wk before
🌶️ Okra	Start indoors	February 4 – February 26	4 wk before
🌱 Radishes	Direct sow	February 4 – February 26	4 wk before
🥔 Turnips	Direct sow	February 4 – February 26	4 wk before
🥬 Cabbage	Set out	February 11 – March 5	3 wk before
🥕 Carrots	Direct sow	February 11 – March 5	3 wk before
🥬 Collards	Direct sow	February 11 – March 5	3 wk before
🥬 Collards	Set out	February 11 – March 5	3 wk before
🥒 Cucumbers	Start indoors	February 11 – March 5	3 wk before
🧅 Green Onions	Set out	February 11 – March 5	3 wk before
🥬 Kale	Direct sow	February 11 – March 5	3 wk before
🥬 Kale	Set out	February 11 – March 5	3 wk before
🥬 Kohlrabi	Direct sow	February 11 – March 5	3 wk before
🥬 Kohlrabi	Set out	February 11 – March 5	3 wk before
🥬 Leaf Lettuce	Direct sow	February 11 – March 5	3 wk before
🎃 Pumpkins	Start indoors	February 11 – March 5	3 wk before
🎃 Summer Squash	Start indoors	February 11 – March 5	3 wk before
🎃 Winter Squash	Start indoors	February 11 – March 5	3 wk before
🥒 Zucchini	Start indoors	February 11 – March 5	3 wk before
🥬 Bok Choy	Direct sow	February 18 – March 12	2 wk before
🥬 Bok Choy	Set out	February 18 – March 12	2 wk before
🥦 Broccoli	Set out	February 18 – March 12	2 wk before
🌿 Cilantro	Direct sow	February 18 – March 12	2 wk before
🥬 Leaf Lettuce	Set out	February 18 – March 12	2 wk before
🥬 Swiss Chard	Direct sow	February 18 – March 12	2 wk before
🥬 Swiss Chard	Set out	February 18 – March 12	2 wk before
🌿 Dill	Direct sow	February 25 – March 19	1 wk before
🫘 Bush Beans	Direct sow	March 11 – April 2	1 wk after
🥒 Cucumbers	Set out	March 11 – April 2	1 wk after
🎃 Pumpkins	Direct sow	March 11 – April 2	1 wk after
🎃 Pumpkins	Set out	March 11 – April 2	1 wk after
🎃 Summer Squash	Direct sow	March 11 – April 2	1 wk after
🎃 Summer Squash	Set out	March 11 – April 2	1 wk after
🌽 Sweet Corn	Direct sow	March 11 – April 2	1 wk after
🍅 Tomatoes	Set out	March 11 – April 2	1 wk after
🎃 Winter Squash	Direct sow	March 11 – April 2	1 wk after
🎃 Winter Squash	Set out	March 11 – April 2	1 wk after
🥒 Zucchini	Direct sow	March 11 – April 2	1 wk after
🥒 Zucchini	Set out	March 11 – April 2	1 wk after
🥒 Cucumbers	Direct sow	March 18 – April 9	2 wk after
🌶️ Okra	Direct sow	March 18 – April 9	2 wk after
🌶️ Okra	Set out	March 18 – April 9	2 wk after
🌶️ Peppers	Set out	March 18 – April 9	2 wk after
🫘 Southern Peas	Direct sow	March 18 – April 9	2 wk after
🍠 Sweet Potato	Set out	March 18 – April 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 lives through a zone 8b winter

Of 74 perennial edibles, 54 come through a zone 8b winter — and 11 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, Elderberry, Asparagus, Horseradish, Sunchoke, Walking Onion, Chives.

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 14 to be careful. Median March 4 – March 26 across 5 stations; February 13 is the optimistic end.
First fall freeze: Plan to October 22 to be careful. Median November 6 – November 22 across 5 stations; December 11 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 79 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
Atlanta, TX	USC00410408	March 19	November 11	237 days
Daingerfield 9 S, TX	USC00412225	March 8	November 22	259 days
Dekalb, TX	USC00412352	March 26	November 6	225 days
Jefferson, TX	USC00414577	March 18	November 8	236 days
Wright Patman Dm & Lk, TX	USC00419916	March 4	November 21	261 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

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

More of Texas

Counties with the same zones — 8b

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 92 °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.

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.