Place guide
Planting zones in Brownsville-Harlingen, TX
This metro spans USDA zones 10a to 10b, so there is no single zone for Brownsville-Harlingen, TX and anyone who gives you one is rounding. 94% of its ZIP codes are zone 10a; the rest are not.
Your ZIP code
Get the exact answer for your address
Everything above describes Brownsville-Harlingen, TX 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.
What you can sow in Brownsville-Harlingen, TX now
14 of 32 crops that every one of the 8 NOAA stations serving this metro area agrees still has time to mature — with a week in hand, so this holds until the page is next rebuilt.
- 🧅 Green Onions 55d
- 🥬 Swiss Chard 55d
- 🫘 Bush Beans 55d
- 🥒 Zucchini 55d
- 🎃 Summer Squash 55d
- 🌶️ Okra 55d
- 🥬 Kale 60d
- 🥬 Collards 60d
- 🥒 Cucumbers 60d
- 🫘 Southern Peas 65d
- 🥕 Carrots 70d
- 🌽 Sweet Corn 75d
- 🍅 Tomatoes 60d
- 🌶️ Peppers 65d
The freeze dates here cross the new year, so no single range describes them and none is quoted. Each ZIP code's own station is cited in the lookup above.
The growing season at one or more of this metro area's stations crosses 1 January, so a one-year bar would have to start the season after it ended. No chart is drawn rather than a misleading one.
Which zone you are in depends where you are
Brownsville-Harlingen, TX covers 2 hardiness zones. A guide that gives the metro one zone has picked whichever is largest and rounded everyone else into it — which is fine for the 94% in zone 10a and wrong for the other 6%. Here is the actual split.
| Zone | ZIP codes | Share | |
|---|---|---|---|
| 10a | 15 | 94% | |
| 10b | 1 | 6% |
Zones are published per ZIP code, so yours is exact even though the metro's is not. The hardiness tool will tell you which one you are in.
Your freeze dates
No freeze range is shown for Brownsville-Harlingen, TX, because the freeze window here crosses New Year, so an earliest-to-latest range would be arithmetic on dates that do not sit in order. The tools below still answer for individual ZIP codes here, and will say what applies.
Your growing season
NOAA publishes a growing-season length for each station, and across the 8 stations serving Brownsville-Harlingen, TX it runs 355–365 days . That figure is published, not computed from the two freeze dates — subtracting one from the other gives the wrong answer wherever a season crosses New Year. Mean summer high (June–August) runs 91–97 °F , at or above the 90 °F point where cool-season crops bolt and tomato and pepper pollen fails — so midsummer sowings of lettuce and its relatives are worth holding here. Summer rain over the same months runs 5.5–7.3" across those 7 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 52% 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 96 °F summer afternoon drying the soil faster than a cool one.
What survives the winter changes across Brownsville-Harlingen, TX
Of 74 perennial fruits, nuts, berries, vegetables and herbs, 25 come through the winter in zone 10a and only 24 in zone 10b. That is a different garden at each end of the same metro.
| Zone | ZIPs | Survive | Fail for being too warm |
|---|---|---|---|
| 10a | 15 | 25 of 74 | 49 |
| 10b | 1 | 24 of 74 | 50 |
The last column is the counterintuitive one, and it is why the totals do not simply rise as the winters get milder. Most temperate fruit needs a documented number of hours below about 45 °F to break dormancy and set a crop, so an apple fails in a winter that is too warm; currants and rhubarb cook in the summer heat that comes with it. See the full list with reasons.
At least one station here freezes across the new year, which puts the two ends of a spread on opposite sides of the calendar. Drawing it would produce a bar spanning almost the whole year and meaning nothing, so none is drawn.
The 8 stations behind these numbers
All 8 NOAA stations whose normals this page quotes, spanning about 39 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 metro area.
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.
Every figure above comes from these, and each is named so you can check it. Which station serves a given ZIP code, and how far away it is, varies across the metro — the table below gives it per ZIP code rather than this page averaging it.
| Station | NOAA ID | Last spring freeze | First fall freeze | Season |
|---|---|---|---|---|
| Brownsville, TX | USW00012919 | January 6 | January 2 | 365 days |
| Harlingen Rio Grande AP, TX | USW00012904 | January 8 | December 29 | 357 days |
| Harlingen, TX | USC00413943 | January 9 | January 3 | 365 days |
| Port Isabel Cameron AP, TX | USW00012957 | January 8 | January 4 | 365 days |
| Port Isabel, TX | USC00417179 | January 3 | January 1 | 365 days |
| Santa Rosa 3 Wnw, TX | USC00418059 | January 10 | December 27 | 355 days |
| Weslaco, TX | USC00419588 | January 8 | December 31 | 365 days |
| Wfo Brownsville, TX | USC00419649 | January 9 | January 4 | 365 days |
These are medians, not averages — NOAA publishes freeze dates as a probability distribution, and half of years freeze later than the date shown.
Every ZIP code in Brownsville-Harlingen, TX
Zones are published per ZIP code, not per metro area, so this is the exact answer rather than the metro area'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 |
|---|---|---|---|
| 78520 | 10a | Wfo Brownsville, TX | 13.8 km |
| 78521 | 10a | Brownsville, TX | 10.5 km |
| 78526 | 10a | Wfo Brownsville, TX | 9.4 km |
| 78535 | 10a | Harlingen, TX | 7.8 km |
| 78550 | 10a | Harlingen Rio Grande AP, TX | 3.2 km |
| 78552 | 10a | Harlingen, TX | 7.8 km |
| 78559 | 10a | Santa Rosa 3 Wnw, TX | 14.1 km |
| 78566 | 10a | Port Isabel Cameron AP, TX | 5.3 km |
| 78567 | 10a | Harlingen, TX | 18.8 km |
| 78575 | 10a | Wfo Brownsville, TX | 18.5 km |
| 78578 | 10a | Port Isabel, TX | 5.6 km |
| 78583 | 10a | Port Isabel Cameron AP, TX | 18.3 km |
| 78586 | 10a | Harlingen, TX | 10.7 km |
| 78592 | 10a | Weslaco, TX | 17.9 km |
| 78593 | 10a | Santa Rosa 3 Wnw, TX | 4.9 km |
| 78597 | 10b | Port Isabel Cameron AP, TX | 13.8 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.
Your own ZIP
Work out your own dates
Each of these takes a ZIP code and answers for that ZIP alone, citing the station it used and how far away it is. There is a ZIP box in the header of every page.
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What survives my winter?
Runs on the hardiness zone, so it answers for all of Brownsville-Harlingen, TX at once — zone across 74 perennial fruits, berries, vegetables and herbs.
- When do I start my seeds?
Dates every spring job from your own last freeze — sow indoors, set out, direct sow.
- When do I sow the next round?
How often each crop is worth re-sowing, and when the next sowing is due.
- What can I still plant?
Counts the growing days left before your first fall freeze, crop by crop.
Other places to compare
These metros span exactly the same zones — 10a–10b — so the same plants are in and out of range across them. The freeze dates and the spring calendar are their own.
- Punta Gorda, FL — zones 10a–10b
- Port St. Lucie, FL — zones 10a–10b
- Naples-Marco Island, FL — zones 10a–10b
Gardening in Texas — zones 6b– 10b covers the whole state: how its 1,979 ZIP codes divide between 9 hardiness zones, and the freeze dates across every NOAA station in it.
Other metro areas in TX:
- San Angelo, TX Zone 8a
- Tyler, TX Zone 8b
- Victoria, TX Zones 9a–9b
- Laredo, TX Zone 9b
- Midland, TX Zones 8a–8b
- Odessa, TX Zones 8a–8b
- Eagle Pass, TX Zone 9a
- Dallas-Fort Worth-Arlington, TX Zones 8a–8b
- Houston-Pasadena-The Woodlands, TX Zones 9a–10a
- San Antonio-New Braunfels, TX Zones 8a–9a
- Austin-Round Rock-San Marcos, TX Zones 8b–9a
- Lubbock, TX Zones 7b–8a
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 96 °F, at or above the 90 °F point where lettuce and spinach bolt and tomato pollen fails.
- Soaker hose and drip kitsThe stations here publish no ordinary freeze window, so frost is not what limits the season — water is, through a summer that does not stop.
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
The hardiness zone is the USDA 2023 Plant Hardiness Zone Map, published per ZIP code by PRISM at Oregon State. The freeze dates are NOAA's 1991–2020 Climate Normals, read from every station whose normals cover a ZIP code in this metro. Nothing here is estimated, and no station stands in for another.
This page names no single station on purpose. Picking one to represent a metro sounds reasonable and is not: the station serving the most ZIP codes is an artifact of where ZIP centroids happen to fall, and it selects a lock on the Monongahela for Pittsburgh and a far southern suburb for Chicago. A range across every station is true; a single cited date for a whole metro is not.