Frost dates for ZIP 78582 (Rio Grande City, TX)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Rio Grande City, TX (11 miles away).
- Average last spring frostJan 3150% chance of a 32°F freeze after this date
- Average first fall frostDec 1750% chance of a 32°F freeze by this date
- Growing season (frost-free)321 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°F avg. coldest night
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This week in your yard
As of Oct 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
77°F 55°F or warmer
24-hour average · latest 75°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Rancho Las Comitas (18 mi), Edinburg 17 NNE (42 mi), Texas AgriScience (54 mi).
4-inch depth
79°F 55°F or warmer
24-hour average · latest 79°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Rancho Las Comitas (18 mi), Edinburg 17 NNE (42 mi), Texas AgriScience (54 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 78582 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 79°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): not yet. Apply as soil cools toward 70°F (typically October to early November).
Fertilizer window
Lawn region: Gulf Coast and peninsular Florida. Timing only; always follow the product label.
- St. Augustinegrass (warm-season): Spring: About 2–3 weeks after full green-up (May in the Carolinas; earlier in Florida and south Texas) (about Mar 11 here, using green-up about 3–4 weeks after your average last frost); Summer: Light feedings June–August where local rules allow; Last: No later than about mid-September in the Carolinas, about 6–8 weeks before first frost elsewhere. Avoid: Feeding before green-up or late in fall (feeds weeds and favors large patch and cold injury).
Plant now
- Lettuce: fall sowing Oct 8–Nov 5
- Kale: fall transplant Sep 24–Oct 22
- Collards: fall transplant Sep 24–Oct 22
- Kohlrabi: fall sowing Oct 8–22
- Swiss chard: fall sowing Oct 8–22
- Beet: fall sowing Oct 8–22
- Turnip: fall sowing Oct 8–22
- Green onion / scallion: fall sowing Oct 8–22
- Strawberry (plants): fall transplant Oct 8–Nov 5
Coming up in the next 3 weeks
- Lettuce: fall transplant Oct 22–Nov 12
- Spinach: fall sowing Oct 22–Nov 12
- Bok choy / Asian greens: fall sowing Oct 22–Nov 5
- Arugula: fall sowing Oct 22–Nov 19
- Mustard greens: fall sowing Oct 22–Nov 5
- Radish: fall sowing Nov 5–19
- Garlic: fall sowing Nov 5–Dec 3
- Shallot: fall sowing Nov 5–Dec 3
- Cilantro: fall sowing Oct 22–Nov 5
- Dill: fall sowing Oct 22–Nov 5
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Dec 29 (prior Dec) |
| 50% (the "average" last frost) | Jan 31 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 4 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 22 |
| 50% (the "average" first frost) | Dec 17 |
| 90% (late: most years have frozen by now) | Jan 20 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Feb 22 | Dec 1 |
| 32°F (freeze) | Jan 31 | Dec 17 |
| 28°F (hard freeze) | Jan 12 | Dec 29 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 78582
Dates count from your average last spring frost (Jan 31) and first fall frost (Dec 17). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Dec 6–20 | Feb 7–21 (transplant) | Aug 20–Sep 17 (transplant) |
| Pepper (sweet and hot) | Nov 22–Dec 6 | Feb 14–28 (transplant) | Aug 27–Sep 17 (transplant) |
| Eggplant | Nov 22–Dec 6 | Feb 14–28 (transplant) | Aug 27–Sep 17 (transplant) |
| Tomatillo | Dec 6–20 | Feb 7–21 (transplant) | – |
| Lettuce | Dec 6–20 | Jan 10–31 (transplant) Jan 3–Feb 14 (sow outdoors) | Oct 22–Nov 12 (transplant) Oct 8–Nov 5 (sowing) |
| Spinach | – | Dec 20–Jan 10 (sow outdoors) | Oct 22–Nov 12 (sowing) |
| Kale | Dec 6–20 | Jan 3–17 (transplant) Jan 3–17 (sow outdoors) | Sep 24–Oct 22 (transplant) Sep 10–Oct 8 (sowing) |
| Collards | Dec 6–20 | Jan 3–31 (transplant) Jan 3–31 (sow outdoors) | Sep 24–Oct 22 (transplant) Sep 10–Oct 8 (sowing) |
| Broccoli | Nov 22–Dec 6 | Jan 3–17 (transplant) | Sep 10–Oct 8 (transplant) |
| Cabbage | Nov 22–Dec 6 | Jan 3–17 (transplant) | Sep 10–Oct 8 (transplant) |
| Cauliflower | Nov 22–Dec 6 | Jan 17–31 (transplant) | Sep 10–Oct 8 (transplant) |
| Brussels sprouts | Nov 8–22 | Jan 3–17 (transplant) | Aug 27–Sep 17 (transplant) |
| Kohlrabi | Dec 6–20 | Jan 3–17 (transplant) Jan 3–17 (sow outdoors) | Oct 8–22 (sowing) |
| Bok choy / Asian greens | – | Jan 3–17 (sow outdoors) | Oct 22–Nov 5 (sowing) |
| Arugula | – | Jan 3–31 (sow outdoors) | Oct 22–Nov 19 (sowing) |
| Mustard greens | – | Jan 3–24 (sow outdoors) | Oct 22–Nov 5 (sowing) |
| Swiss chard | Dec 20–Jan 3 | Jan 17–Feb 7 (transplant) Jan 17–Feb 14 (sow outdoors) | Oct 8–22 (sowing) |
| Beet | – | Jan 3–31 (sow outdoors) | Oct 8–22 (sowing) |
| Carrot | – | Jan 10–Feb 7 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Radish | – | Dec 27–Feb 7 (sow outdoors) | Nov 5–19 (sowing) |
| Turnip | – | Jan 3–24 (sow outdoors) | Oct 8–22 (sowing) |
| Parsnip | – | Jan 10–31 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 6–Jan 3 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Onion (bulbing) | Nov 8–22 | Dec 20–Jan 3 (transplant) | – |
| Green onion / scallion | – | Dec 20–Jan 17 (sow outdoors) | Oct 8–22 (sowing) |
| Leek | Nov 8–22 | Jan 3–17 (transplant) | – |
| Garlic | – | – | Nov 5–Dec 3 (sowing) |
| Shallot | – | Dec 20–Jan 3 (transplant) | Nov 5–Dec 3 (sowing) |
| Potato | – | Jan 3–17 (transplant) | Aug 27–Sep 10 (transplant) |
| Sweet potato | – | Feb 21–Mar 7 (transplant) | – |
| Sweet corn | – | Feb 7–21 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 7–21 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Bean, pole | – | Feb 7–21 (sow outdoors) | – |
| Lima bean | – | Feb 14–28 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 21–Mar 14 (sow outdoors) | – |
| Cucumber | Jan 3–10 | Feb 7–21 (transplant) Feb 7–21 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Summer squash / zucchini | Jan 3–10 | Feb 7–21 (transplant) Feb 7–21 (sow outdoors) | Sep 24–Oct 8 (sowing) |
| Winter squash | Jan 3–10 | Feb 7–21 (transplant) Feb 7–21 (sow outdoors) | – |
| Pumpkin | – | Feb 7–21 (sow outdoors) | – |
| Watermelon | Jan 3–10 | Feb 14–28 (transplant) Feb 14–28 (sow outdoors) | – |
| Cantaloupe / muskmelon | Jan 3–10 | Feb 14–28 (transplant) Feb 14–28 (sow outdoors) | – |
| Okra | Dec 20–Jan 3 | Feb 14–28 (transplant) Feb 14–28 (sow outdoors) | – |
| Celery | Nov 8–22 | Feb 7–14 (transplant) | – |
| Basil | Dec 20–Jan 3 | Feb 7–21 (transplant) Feb 7–21 (sow outdoors) | – |
| Cilantro | – | Jan 17–Feb 14 (sow outdoors) | Oct 22–Nov 5 (sowing) |
| Parsley | Nov 22–Dec 6 | Jan 17–31 (transplant) Jan 10–31 (sow outdoors) | – |
| Dill | – | Jan 31–Feb 14 (sow outdoors) | Oct 22–Nov 5 (sowing) |
| Sunflower | – | Jan 31–Feb 14 (sow outdoors) | – |
| Asparagus (crowns) | – | Jan 3–17 (transplant) | – |
| Rhubarb (crowns) | – | Jan 3–17 (transplant) | – |
| Strawberry (plants) | – | Jan 3–17 (transplant) | Oct 8–Nov 5 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Plants that do well here
Texas A&M AgriLife trials name plants that handle Texas conditions: the Texas Superstar® list and the low-care roses from AgriLife trials. Plant frost-tender annuals after January 31 here (the average last frost). More on plants for Texas. Not affiliated with Texas A&M AgriLife.
Where these numbers come from
Station: Rio Grande City, TX (NOAA GHCN-Daily ID USC00417622), elevation 172 ft, 11.5 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Falcon Dam, TX | 25 mi | Jan 9 | Jan 1 (next year) |
| La Joya, TX | 30 mi | Jan 23 | Dec 28 |
| Mccook, TX | 38 mi | Jan 22 | Dec 19 |
The average last-frost dates of these stations span 22 days, a rough guide to local variation. See data sources & methods.
Frost questions for 78582
When is the last frost in 78582?
The average (50% chance) last spring freeze of 32°F for ZIP 78582 is January 31. For a more cautious planting date, use March 4, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78582?
The average first fall freeze is December 17. In 1 year in 10 it comes by November 22.
What hardiness zone is 78582?
ZIP 78582 is in USDA zone 9b (25 to 30°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 78582 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
78591 Santa Anna 78584 Roma 78547 Garciasville 78548 La Grulla 78595 Sullivan City 78536 Delmita 78585 78576 Penitas
Other ZIP codes in Starr County
78536 78545 78547 78548 78584 78585 78588 78591 All Starr County frost dates · Texas frost dates
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