What USDA hardiness zone is Washington County, Mississippi?

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

When is the last spring frost in Washington County, Mississippi?

The median last spring freeze runs March 5 – March 13 across the 5 NOAA weather stations serving Washington County, Mississippi, from NOAA 1991-2020 Climate Normals. Half of years freeze later than the median.

Mississippi

Planting zones in Washington County, Mississippi

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 10 ZIP codes

ZIP codes 10 10 have a NOAA station within range

Weather stations 5 NOAA 1991–2020 normals, across 724 sq mi

Your ZIP code

Get the exact answer for your address

Everything above describes Washington County, Mississippi 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 Washington County is closing

Nothing in the 32-crop table still has time to mature here. The first fall freeze normally arrives November 13 – November 20 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 8 – January 16 — counted back from a last spring freeze of March 5 – March 13 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 13 – November 13 as growing season (245 days). Widening to any single station gives March 5 – November 20 (260 days).

Your freeze dates

Last spring freeze March 5 – March 13

First fall freeze November 13 – November 20

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 244–261 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 90.6–92.3 °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 9.3–12.4" 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 87% 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 Washington 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
38701	8b	Greenville, MS	6.9 km
38703	8b	Greenville Asos, MS	6.3 km
38722	8b	Stoneville Exp Stn, MS	19.2 km
38723	8b	Greenville, MS	14.5 km
38731	8b	Eudora, AR	12.3 km
38744	8b	Rolling Fork, MS	21.3 km
38748	8b	Greenville, MS	28.4 km
38756	8b	Stoneville Exp Stn, MS	6.6 km
38760	8b	Greenville Asos, MS	3.3 km
38776	8b	Stoneville Exp Stn, MS	1.7 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 Washington 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 8 – January 16	8 wk before
🌶️ Peppers	Start indoors	January 8 – January 16	8 wk before
🥦 Broccoli	Start indoors	January 22 – January 30	6 wk before
🥬 Cabbage	Start indoors	January 22 – January 30	6 wk before
🥬 Collards	Start indoors	January 22 – January 30	6 wk before
🥬 Kale	Start indoors	January 22 – January 30	6 wk before
🥬 Leaf Lettuce	Start indoors	January 22 – January 30	6 wk before
🫛 Peas	Direct sow	January 22 – January 30	6 wk before
🥬 Spinach	Direct sow	January 22 – January 30	6 wk before
🍠 Sweet Potato	Start indoors	January 22 – January 30	6 wk before
🍅 Tomatoes	Start indoors	January 22 – January 30	6 wk before
🥬 Bok Choy	Start indoors	January 29 – February 6	5 wk before
🥬 Kohlrabi	Start indoors	January 29 – February 6	5 wk before
🥬 Swiss Chard	Start indoors	January 29 – February 6	5 wk before
🥬 Arugula	Direct sow	February 5 – February 13	4 wk before
🥬 Baby Salad Greens	Direct sow	February 5 – February 13	4 wk before
🥕 Beets	Direct sow	February 5 – February 13	4 wk before
🧅 Green Onions	Direct sow	February 5 – February 13	4 wk before
🥬 Mustard Greens	Direct sow	February 5 – February 13	4 wk before
🌶️ Okra	Start indoors	February 5 – February 13	4 wk before
🌱 Radishes	Direct sow	February 5 – February 13	4 wk before
🥔 Turnips	Direct sow	February 5 – February 13	4 wk before
🥬 Cabbage	Set out	February 12 – February 20	3 wk before
🥕 Carrots	Direct sow	February 12 – February 20	3 wk before
🥬 Collards	Direct sow	February 12 – February 20	3 wk before
🥬 Collards	Set out	February 12 – February 20	3 wk before
🥒 Cucumbers	Start indoors	February 12 – February 20	3 wk before
🧅 Green Onions	Set out	February 12 – February 20	3 wk before
🥬 Kale	Direct sow	February 12 – February 20	3 wk before
🥬 Kale	Set out	February 12 – February 20	3 wk before
🥬 Kohlrabi	Direct sow	February 12 – February 20	3 wk before
🥬 Kohlrabi	Set out	February 12 – February 20	3 wk before
🥬 Leaf Lettuce	Direct sow	February 12 – February 20	3 wk before
🎃 Pumpkins	Start indoors	February 12 – February 20	3 wk before
🎃 Summer Squash	Start indoors	February 12 – February 20	3 wk before
🎃 Winter Squash	Start indoors	February 12 – February 20	3 wk before
🥒 Zucchini	Start indoors	February 12 – February 20	3 wk before
🥬 Bok Choy	Direct sow	February 19 – February 27	2 wk before
🥬 Bok Choy	Set out	February 19 – February 27	2 wk before
🥦 Broccoli	Set out	February 19 – February 27	2 wk before
🌿 Cilantro	Direct sow	February 19 – February 27	2 wk before
🥬 Leaf Lettuce	Set out	February 19 – February 27	2 wk before
🥬 Swiss Chard	Direct sow	February 19 – February 27	2 wk before
🥬 Swiss Chard	Set out	February 19 – February 27	2 wk before
🌿 Dill	Direct sow	February 26 – March 6	1 wk before
🫘 Bush Beans	Direct sow	March 12 – March 20	1 wk after
🥒 Cucumbers	Set out	March 12 – March 20	1 wk after
🎃 Pumpkins	Direct sow	March 12 – March 20	1 wk after
🎃 Pumpkins	Set out	March 12 – March 20	1 wk after
🎃 Summer Squash	Direct sow	March 12 – March 20	1 wk after
🎃 Summer Squash	Set out	March 12 – March 20	1 wk after
🌽 Sweet Corn	Direct sow	March 12 – March 20	1 wk after
🍅 Tomatoes	Set out	March 12 – March 20	1 wk after
🎃 Winter Squash	Direct sow	March 12 – March 20	1 wk after
🎃 Winter Squash	Set out	March 12 – March 20	1 wk after
🥒 Zucchini	Direct sow	March 12 – March 20	1 wk after
🥒 Zucchini	Set out	March 12 – March 20	1 wk after
🥒 Cucumbers	Direct sow	March 19 – March 27	2 wk after
🌶️ Okra	Direct sow	March 19 – March 27	2 wk after
🌶️ Okra	Set out	March 19 – March 27	2 wk after
🌶️ Peppers	Set out	March 19 – March 27	2 wk after
🫘 Southern Peas	Direct sow	March 19 – March 27	2 wk after
🍠 Sweet Potato	Set out	March 19 – March 27	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 5 to be careful. Median March 5 – March 13 across 5 stations; February 12 is the optimistic end.
First fall freeze: Plan to October 30 to be careful. Median November 13 – November 20 across 5 stations; December 10 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 65 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
Eudora, AR	USC00032355	March 13	November 14	244 days
Greenville Asos, MS	USW00013939	March 12	November 13	247 days
Greenville, MS	USC00223605	March 13	November 15	247 days
Rolling Fork, MS	USC00227560	March 5	November 20	261 days
Stoneville Exp Stn, MS	USC00228445	March 11	November 16	250 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

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

More of Mississippi

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.