Starr County, TX — Planting Guide
Starr County is in USDA Zone 9b. The average last spring frost is February 3 and the first fall frost is December 16, giving you a growing season of approximately 317 days.
At an elevation of 2,451 ft, Starr County receives approximately 55.4 in of rainfall annually. Summer highs average 98°F with winter lows around 51°F. The predominant soil type is Loam.
Based on 22 years of NOAA climate station data, the last frost date here varies by 55 days year to year — ranging from January 8 in warm years to March 3 in cold years. The growing season is trending longer by about 6.64 days per decade. Starr County scores 44/100 (Moderate) on the Microclimate Index.
🌡️ Zone
9b (25°F to 30°F min)
❄️ Last Frost
February 3
🍂 First Frost
December 16
📅 Growing Season
317 days
⛰️ Elevation
2,451 ft
🌧️ Annual Rainfall
55.4 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.6 in | 3 days | — | None |
| Feb | 1.9 in | 4 days | 2.4 in | High |
| Mar | 3.4 in | 5 days | 0.9 in | Moderate |
| Apr | 6.6 in | 7 days | — | Low |
| May | 8.8 in | 9 days | — | Low |
| Jun | 7.6 in | 10 days | — | Low |
| Jul | 7 in | 7 days | — | Low |
| Aug | 6.4 in | 7 days | — | Low |
| Sep | 4.9 in | 6 days | — | Low |
| Oct | 4 in | 5 days | 0.3 in | Low |
| Nov | 1.6 in | 4 days | 2.7 in | High |
| Dec | 1.6 in | 3 days | — | None |
Annual total: 55.4 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Starr County Soil Profile
Soil Type
Loam
Soil pH
6.8-7.5
Drainage
Well Drained
Frost Risk Probability
Based on 22 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | Mar 3 | Dec 25 | 297 days |
| Cautious | Feb 13 | Dec 22 | 312 days |
| Average year | Feb 3 | Dec 16 | 316 days |
| Optimistic | Jan 18 | Dec 10 | 326 days |
| Aggressive (risky) | Jan 8 | Nov 30 | 326 days |
Not very — frost dates can vary by ±55 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting longer here (about 6.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Starr County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Starr County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Starr County's climate and soil.
County Extension Office
Starr County Texas A&M AgriLife Extension Extension Office
Phone: 979-845-7800
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Starr County
Finding local nurseries & garden centers in Starr County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Starr County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Starr County TX" or "garden center Starr County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Starr County TX" or check your extension office and local parks department. Facebook groups like "Starr County Gardeners" or "Texas Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
13.7 hours
Summer solstice daylight
Shortest Day
10.3 hours
Winter solstice daylight
Peak Sun Hours
10.1 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your shorter days favor short-day onion varieties like Vidalia, Texas 1015, and Red Creole. Plant in fall for best results.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 10.5 hr | 6 hr | Short day |
| February | 11.1 hr | 6.4 hr | Short day |
| March | 11.8 hr | 7.1 hr | Short day |
| April | 12.6 hr | 7.7 hr | Neutral |
| May | 13.3 hr | 8.2 hr | Neutral |
| June | 13.7 hr | 9.1 hr | Neutral |
| July | 13.5 hr | 10.1 hr | Neutral |
| August | 12.9 hr | 9 hr | Neutral |
| September | 12.1 hr | 8.4 hr | Neutral |
| October | 11.4 hr | 7.3 hr | Short day |
| November | 10.7 hr | 5.9 hr | Short day |
| December | 10.3 hr | 5.9 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Apr through Nov.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
10 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 49°F | 54°F | 🐢 Slow | ~24 weeks |
| Feb | 49°F | 53°F | 🐢 Slow | ~24 weeks |
| Mar | 55°F | 57°F | ♻️ Active | ~14 weeks |
| Apr | 65°F | 63°F | ♻️ Active | ~14 weeks |
| May | 73°F | 70°F | 🔥 Peak | ~8 weeks |
| Jun | 81°F | 80°F | 🔥 Peak | ~8 weeks |
| Jul | 90°F | 84°F | 🔥 Peak | ~8 weeks |
| Aug | 91°F | 89°F | 🔥 Peak | ~8 weeks |
| Sep | 85°F | 86°F | 🔥 Peak | ~8 weeks |
| Oct | 77°F | 78°F | 🔥 Peak | ~8 weeks |
| Nov | 61°F | 70°F | ♻️ Active | ~14 weeks |
| Dec | 54°F | 59°F | ♻️ Active | ~14 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Starr County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
High — expect multiple pest generations. Preventative measures essential.
Disease Risk
High fungal/bacterial risk. Space plants for airflow, water at soil level.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | High | Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Whiteflies | High | Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Spider mites | High | May, Jun, Jul, Aug, Sep, Oct |
| Fire ants | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Thrips | Moderate | Apr, May, Jun, Jul, Aug |
| Leaf miners | Low | Mar, Apr, May, Jun |
Organic pest management tips
- Install physical barriers: floating row covers, copper tape for slugs, mesh netting
- Apply Bt (Bacillus thuringiensis) for caterpillar control — safe for beneficial insects
- Use kaolin clay spray to deter a wide range of insects on fruiting crops
- Release beneficial insects: ladybugs for aphids, parasitic wasps for caterpillars
- Apply neem oil weekly during high-pressure months
- Mulch heavily (3-4 inches) to reduce soil-borne disease splash
Cover Crops for Starr County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (4 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Feb 13 | Oct 21 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Feb 8 | Oct 7 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Feb 8 | Oct 7 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Jan 3 | Oct 7 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | Mar 2 | Dec 2 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (4 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Oct 21 | Jan 13 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Oct 15 | Jan 20 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Oct 25 | Jan 13 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Oct 1 | Jan 20 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 17 mph Summer: 12 mph
Fall: 13 mph Winter: 15 mph
Prevailing wind: S. Windy area — plant a windbreak hedge on the S side of your garden.
Windbreak Benefit
8.9/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
Low
Relatively flat terrain (166 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
27,611 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 1,500 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Apr, May, Jun, Jul
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Nov, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 55.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 27,611 gallons annually
- Rainwater harvesting is fully legal in your state
- Your area gets ample rainfall — even small barrels make a big difference
- Consider a rain garden to handle overflow during heavy rainfall months
Soil & Growing Conditions in Starr County
Soil Type
Loam
Soil pH 6.8–7.5 · Moderately Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
317-day frost-free season
Your long season supports multiple successions and heat-demanding crops like melons, sweet potatoes, and peppers. Plant warm-season crops as soon as soil warms.
Free Garden Planner
Plan your entire garden season — organize planting dates, track what you're growing, and know exactly when to start seeds, transplant, and harvest.
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
🥬 Vegetables to Grow in Starr County
115 vegetables that grow well in Zone 9b with planting dates for Starr County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Jan 6 | Feb 3 | Feb 10 | May 5 – Jun 9 | 80–100 |
| Amaranth | Dec 23 | Feb 3 | Feb 10 | May 12 – Jun 30 | 90–120 |
| Artichoke | — | — | Feb 17 | Jun 23 – Sep 1 | 120–180 |
| Arugula | Jan 6 | Jan 13 | Feb 3 | Mar 10 – May 12 | 30–50 |
| Asparagus | — | — | Feb 17 | — | 730–1095 |
| Beets | — | Jan 13 | — | Mar 10 – Apr 7 | 50–70 |
| Belgian Endive | Jan 6 | Jan 13 | Feb 3 | May 26 – Jul 21 | 110–150 |
| Bitter Melon | Dec 23 | Feb 3 | Feb 10 | Apr 14 – May 26 | 60–90 |
| Black Beans | — | Feb 10 | — | May 12 – Jun 30 | 90–120 |
| Bok Choy | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 21 | 40–60 |
| Broccoli | Jan 6 | Jan 13 | Feb 3 | Apr 7 – May 19 | 60–90 |
| Broccoli Rabe | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 21 | 40–60 |
| Brussels Sprouts | Jan 6 | Jan 13 | Feb 3 | May 5 – Jun 30 | 90–130 |
| Butternut Squash | Jan 6 | Feb 3 | Feb 10 | May 12 – Jun 16 | 85–110 |
| Cabbage | Jan 6 | Jan 13 | Feb 3 | Apr 7 – Jun 2 | 60–100 |
| Calabash | Dec 23 | Feb 3 | Feb 10 | May 5 – Jun 30 | 80–120 |
| Cardoon | — | — | Feb 17 | Jun 23 – Aug 4 | 120–150 |
| Carrots | — | Jan 13 | — | Mar 17 – Apr 21 | 60–80 |
| Cauliflower | Jan 6 | Jan 13 | Feb 3 | Mar 31 – Jun 2 | 55–100 |
| Celeriac | Jan 6 | Jan 13 | Feb 3 | May 19 – Jun 23 | 100–120 |
| Celery | Jan 6 | Jan 13 | Feb 3 | Apr 28 – Jun 23 | 80–120 |
| Celtuce | Jan 6 | Jan 13 | Feb 3 | Apr 7 – May 19 | 60–90 |
| Chard | Jan 6 | Jan 13 | Feb 3 | Mar 31 – May 19 | 50–60 |
| Chayote | Dec 23 | Feb 3 | Feb 10 | Jun 16 – Aug 25 | 120–180 |
| Chickpeas | Jan 6 | Jan 13 | Feb 3 | Apr 28 – Jun 9 | 80–110 |
| Chicory | Jan 6 | Jan 13 | Feb 3 | Apr 7 – May 19 | 60–85 |
| Chinese Cabbage | Jan 6 | Jan 13 | Feb 3 | Mar 31 – Apr 28 | 50–70 |
| Christmas Lima Beans | Dec 23 | Feb 3 | Feb 10 | May 5 – Jun 9 | 80–100 |
| Collard Greens | Jan 6 | Jan 13 | Feb 3 | Mar 31 – Jun 2 | 55–75 |
| Corn | — | Feb 10 | — | Apr 14 – Jun 9 | 60–100 |
| Cowpeas | — | Feb 10 | — | Apr 14 – May 26 | 60–90 |
| Cress | Jan 6 | Jan 13 | Feb 3 | Feb 17 – Mar 10 | 14–21 |
| Crookneck Squash | Jan 6 | Feb 3 | Feb 10 | Mar 31 – Apr 28 | 45–60 |
| Crosne | — | Jan 13 | — | Jun 16 – Aug 18 | 150–200 |
| Cucumber | Jan 6 | Feb 3 | Feb 10 | Apr 7 – Jun 2 | 50–70 |
| Daikon | — | Jan 13 | — | Mar 10 – Apr 7 | 50–70 |
| Delicata Squash | Jan 6 | Feb 3 | Feb 10 | May 5 – Jun 9 | 80–100 |
| Edamame | — | Feb 10 | — | Apr 28 – Jun 9 | 75–100 |
| Eggplant | Dec 23 | Feb 3 | Feb 10 | Apr 21 – Jun 23 | 65–85 |
| Endive | Jan 6 | Jan 13 | Feb 3 | Mar 24 – Apr 28 | 45–65 |
| Escarole | Jan 6 | Jan 13 | Feb 3 | Mar 31 – Apr 28 | 50–70 |
| Fava Beans | Jan 6 | Jan 13 | Feb 3 | Apr 21 – Jun 2 | 75–100 |
| Fennel | Dec 23 | Feb 3 | Feb 10 | Apr 14 – May 26 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Dec 23 | Feb 3 | Feb 10 | Oct 13 – Dec 8 | 240–300 |
| Green Beans | — | Feb 10 | — | Apr 7 – Jun 2 | 50–65 |
| Horseradish | — | — | Feb 17 | Jun 23 – Sep 1 | 120–180 |
| Hot Peppers | Dec 23 | Feb 3 | Feb 10 | Apr 21 – Jul 28 | 70–120 |
| Hubbard Squash | Jan 6 | Feb 3 | Feb 10 | May 26 – Jun 30 | 100–120 |
| Jicama | Dec 23 | Feb 3 | Feb 10 | Jun 16 – Aug 25 | 120–180 |
| Kabocha | Jan 6 | Feb 3 | Feb 10 | May 12 – Jun 9 | 85–100 |
| Kai Lan | Jan 6 | Jan 13 | Feb 3 | Mar 24 – Apr 21 | 45–60 |
| Kale | Jan 6 | Jan 13 | Feb 3 | Mar 31 – May 26 | 50–70 |
| Kidney Beans | — | Feb 10 | — | May 12 – Jun 16 | 85–110 |
| Kohlrabi | Jan 6 | Jan 13 | Feb 3 | Mar 24 – Apr 28 | 45–65 |
| Komatsuna | Jan 6 | Jan 13 | Feb 3 | Mar 10 – Apr 14 | 35–50 |
| Leeks | Jan 6 | Jan 13 | Feb 3 | May 5 – Jul 21 | 90–150 |
| Lentils | Jan 6 | Jan 13 | Feb 3 | Apr 28 – Jun 9 | 80–110 |
| Lettuce | Jan 6 | Jan 13 | Feb 3 | Mar 10 – May 19 | 30–60 |
| Lima Beans | — | Feb 10 | — | Apr 14 – May 26 | 60–90 |
| Loofah | Dec 23 | Feb 3 | Feb 10 | May 26 – Jul 28 | 100–150 |
| Luffa | Dec 23 | Feb 3 | Feb 10 | May 12 – Jul 28 | 90–150 |
| Mache | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 21 | 40–60 |
| Malabar Spinach | Dec 23 | Feb 3 | Feb 10 | Apr 7 – May 5 | 55–70 |
| Melon | Jan 6 | Feb 3 | Feb 10 | Apr 21 – Jun 9 | 70–100 |
| Microgreens | Jan 6 | Jan 13 | Feb 3 | Feb 10 – Mar 10 | 7–21 |
| Mitsuba | Jan 6 | Jan 13 | Jan 27 | Mar 24 – May 19 | 50–70 |
| Mizuna | Jan 6 | Jan 13 | Feb 3 | Mar 10 – Apr 7 | 30–45 |
| Mustard Greens | Jan 6 | Jan 13 | Feb 3 | Mar 10 – May 12 | 30–50 |
| Napa Cabbage | Jan 6 | Jan 13 | Feb 3 | Mar 31 – May 5 | 55–75 |
| New Zealand Spinach | Dec 23 | Feb 3 | Feb 10 | Apr 7 – May 5 | 55–70 |
| Okra | Dec 23 | Feb 3 | Feb 10 | Apr 7 – Jun 2 | 50–65 |
| Onion | Jan 6 | Jan 13 | Feb 3 | May 5 – Jun 23 | 90–120 |
| Pac Choi | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 14 | 40–55 |
| Parsnip | — | Jan 13 | — | Apr 28 – Jun 9 | 100–130 |
| Patty Pan Squash | Jan 6 | Feb 3 | Feb 10 | Mar 31 – Apr 28 | 45–60 |
| Peas | Jan 6 | Jan 13 | Feb 3 | Mar 31 – May 26 | 55–70 |
| Peppers | Dec 23 | Feb 3 | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Pole Beans | Dec 23 | Feb 3 | Feb 10 | Apr 7 – Jun 2 | 55–70 |
| Potatoes | Dec 23 | Feb 3 | Feb 10 | Apr 21 – Jun 30 | 70–120 |
| Pumpkin | Jan 6 | Feb 3 | Feb 10 | May 12 – Jun 30 | 85–120 |
| Purslane | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 21 | 40–60 |
| Radicchio | Jan 6 | Jan 13 | Feb 3 | Apr 7 – May 12 | 60–80 |
| Radish | — | Jan 13 | — | Feb 10 – Mar 3 | 22–35 |
| Romanesco | Jan 6 | Jan 13 | Feb 3 | Apr 21 – Jun 2 | 75–100 |
| Rutabaga | — | Jan 13 | — | Apr 7 – May 12 | 80–100 |
| Salsify | — | Jan 13 | — | Apr 28 – Jun 9 | 100–130 |
| Savoy Cabbage | Jan 6 | Jan 13 | Feb 3 | Apr 14 – Jun 9 | 70–110 |
| Scallions | Jan 6 | Jan 13 | Feb 3 | Mar 31 – Apr 28 | 50–70 |
| Scarlet Runner Beans | Dec 23 | Feb 3 | Feb 10 | Apr 14 – May 19 | 60–80 |
| Shallot | Jan 6 | Jan 13 | Feb 3 | May 5 – Jun 23 | 90–120 |
| Shiso | Dec 23 | Feb 10 | Feb 10 | Apr 7 – Jun 2 | 50–70 |
| Snap Peas | Dec 23 | Feb 3 | Feb 10 | Apr 7 – Jun 2 | 55–70 |
| Snow Peas | Jan 6 | Jan 13 | Feb 3 | Mar 31 – May 26 | 50–65 |
| Soybeans | — | Feb 10 | — | May 5 – Jun 30 | 80–120 |
| Spaghetti Squash | Jan 6 | Feb 3 | Feb 10 | May 12 – Jun 9 | 85–100 |
| Spinach | Jan 6 | Jan 13 | Feb 3 | Mar 10 – May 12 | 35–50 |
| Squash (Summer) | Jan 6 | Feb 3 | Feb 10 | Mar 31 – Jun 2 | 45–65 |
| Squash (Winter) | Jan 6 | Feb 3 | Feb 10 | May 5 – Jun 30 | 80–120 |
| Sunchoke | — | — | Feb 17 | Jun 9 – Aug 4 | 110–150 |
| Sunflower | Dec 23 | Feb 3 | Feb 10 | Apr 21 – Jun 9 | 70–100 |
| Sweet Corn | — | Feb 10 | — | Apr 14 – May 26 | 60–90 |
| Sweet Potatoes | Dec 23 | Feb 3 | Feb 10 | May 12 – Jun 30 | 90–120 |
| Tatsoi | Jan 6 | Jan 13 | Feb 3 | Mar 10 – Apr 14 | 35–50 |
| Tomatillo | Dec 23 | Feb 3 | Feb 10 | Apr 14 – Jun 23 | 60–85 |
| Tomatoes | Dec 23 | Feb 3 | Feb 10 | Apr 14 – Jun 23 | 60–85 |
| Turmeric | Dec 23 | Feb 3 | Feb 10 | Oct 13 – Dec 8 | 240–300 |
| Turnip | — | Jan 13 | — | Feb 24 – Mar 31 | 40–60 |
| Watercress | Jan 6 | Jan 13 | Feb 3 | Mar 17 – Apr 21 | 40–60 |
| Watermelon | Jan 6 | Feb 3 | Feb 10 | Apr 21 – Jun 9 | 70–100 |
| Wax Beans | — | Feb 10 | — | Apr 7 – Jun 2 | 50–65 |
| Winter Melon | Dec 23 | Feb 3 | Feb 10 | May 12 – Jun 30 | 90–120 |
| Yam | Dec 23 | Feb 3 | Feb 10 | Aug 11 – Dec 8 | 180–330 |
| Yard Long Beans | Dec 23 | Feb 3 | Feb 10 | Apr 7 – May 19 | 55–80 |
| Zucchini | Jan 6 | Feb 3 | Feb 10 | Mar 31 – May 26 | 45–60 |
🍓 Fruits to Grow in Starr County
24 fruits that grow well in Zone 9b with planting dates for Starr County.
Show all 24 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Feb 17 | May 19 – Sep 1 | 90–180 |
| Blackberries | — | — | Feb 17 | — | 365–730 |
| Boysenberries | — | — | Feb 17 | — | 365–730 |
| Cantaloupe | — | — | Feb 17 | Apr 28 – Jun 2 | 70–90 |
| Che Fruit | — | — | Feb 17 | — | 1095–1825 |
| Dragon Fruit | — | — | Feb 17 | — | 365–730 |
| Elderberries | — | — | Feb 17 | — | 730–1095 |
| Figs | — | — | Feb 17 | — | 730–1825 |
| Goji Berries | — | — | Feb 17 | — | 730–1095 |
| Grapes | — | — | Feb 17 | — | 730–1095 |
| Ground Cherry | — | — | Feb 17 | Apr 28 – Jun 23 | 65–80 |
| Guava | — | — | Feb 17 | — | 365–730 |
| Honeydew | — | — | Feb 17 | May 12 – Jun 23 | 80–110 |
| Kiwi | — | — | Feb 17 | — | 1095–1825 |
| Loquat | — | — | Feb 17 | — | 730–1825 |
| Mulberries | — | — | Feb 17 | — | 730–1825 |
| Passion Fruit | — | — | Feb 17 | — | 365–545 |
| Pawpaw | — | — | Feb 17 | — | 1095–2555 |
| Persimmon | — | — | Feb 17 | — | 1095–2555 |
| Pomegranate | — | — | Feb 17 | — | 730–1095 |
| Quince | — | — | Feb 17 | — | 1095–1825 |
| Raspberries | — | — | Feb 17 | — | 365–730 |
| Serviceberries | — | — | Feb 17 | — | 730–1095 |
| Strawberries | — | — | Feb 17 | May 19 – Dec 15 | 90–365 |
🌿 Herbs to Grow in Starr County
40 herbs that grow well in Zone 9b with planting dates for Starr County.
Show all 40 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Anise | Jan 6 | Jan 13 | Jan 27 | Apr 28 – Jul 14 | 90–120 |
| Basil | Dec 23 | Feb 10 | Feb 10 | Apr 7 – Jun 9 | 50–75 |
| Bee Balm | — | — | Feb 10 | May 12 – Jul 28 | 90–120 |
| Borage | Jan 6 | Jan 13 | Jan 27 | Mar 24 – May 12 | 50–60 |
| Caraway | Jan 6 | Jan 13 | Jan 27 | — | 365–450 |
| Catnip | — | — | Feb 10 | Apr 14 – Jun 16 | 60–80 |
| Chamomile | Jan 6 | Jan 13 | Jan 27 | Mar 31 – Jun 9 | 60–90 |
| Chervil | Jan 6 | Jan 13 | Jan 27 | Mar 10 – May 12 | 40–60 |
| Chives | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Cilantro | Jan 6 | Jan 13 | Jan 27 | Mar 10 – May 12 | 40–60 |
| Comfrey | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Cumin | Jan 6 | Jan 13 | Jan 27 | May 12 – Jul 14 | 100–120 |
| Dill | Jan 6 | Jan 13 | Jan 27 | Mar 10 – May 12 | 40–60 |
| Echinacea | — | — | Feb 10 | Jun 16 – Sep 22 | 120–180 |
| Epazote | Dec 23 | Feb 10 | Feb 10 | Mar 31 – May 26 | 45–60 |
| Fennel (herb) | Jan 6 | Jan 13 | Jan 27 | Mar 31 – Jun 9 | 60–90 |
| Feverfew | — | — | Feb 10 | May 12 – Jul 28 | 90–120 |
| Garlic Chives | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Horehound | — | — | Feb 10 | Apr 28 – Jun 23 | 75–90 |
| Hyssop | — | — | Feb 10 | Apr 21 – Jun 23 | 70–90 |
| Lavender | — | — | Feb 10 | May 12 – Oct 13 | 90–200 |
| Lemon Balm | — | — | Feb 10 | Apr 14 – Jun 2 | 60–70 |
| Lemon Thyme | — | — | Feb 10 | Apr 21 – Jun 23 | 70–90 |
| Lemon Verbena | Dec 23 | Feb 10 | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Lemongrass | Dec 23 | Feb 10 | Feb 10 | Apr 28 – Jul 28 | 75–120 |
| Marjoram | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Mint | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Oregano | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Parsley | Jan 6 | Jan 13 | Jan 27 | Mar 31 – Jun 2 | 60–80 |
| Rosemary | — | — | Feb 10 | May 5 – Sep 22 | 80–180 |
| Rue | — | — | Feb 10 | Apr 21 – Jun 23 | 70–90 |
| Sage | — | — | Feb 10 | Apr 28 – Jun 23 | 75–90 |
| Savory | — | — | Feb 10 | Apr 7 – Jun 2 | 50–70 |
| Sorrel | Jan 6 | Jan 13 | Jan 27 | Mar 10 – May 12 | 40–60 |
| Stevia | Dec 23 | Feb 10 | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Tarragon | — | — | Feb 10 | Apr 14 – Jun 23 | 60–90 |
| Thai Basil | Dec 23 | Feb 10 | Feb 10 | Apr 7 – Jun 9 | 50–75 |
| Thyme | — | — | Feb 10 | Apr 21 – Jun 23 | 70–90 |
| Valerian | — | — | Feb 10 | Jun 16 – Sep 22 | 120–180 |
| Yarrow | — | — | Feb 10 | May 12 – Jul 28 | 90–120 |
Monthly Planting Guide for Starr County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Starr County.
Frequently Asked Questions
What planting zone is Starr County, TX?
Starr County is in USDA Hardiness Zone 9b. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Starr County, TX?
Based on 22 years of NOAA weather station data, the median last spring frost in Starr County falls around February 3. In 8 out of 10 years, last frost lands between January 8 and March 3 — a 55-day window of variability. Use March 3 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Starr County, TX?
The median first fall frost in Starr County arrives around December 16. In cold years it can arrive as early as November 30; in mild years as late as December 25. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Starr County?
Starr County has a frost-free growing season of approximately 317 days. This long season supports multiple succession plantings and warm-season crops that need extended heat, like sweet potatoes and melons. Climate records show the growing season is trending longer by about 6.64 days per decade.
What is the soil like in Starr County for gardening?
Starr County has predominantly Loam soil with a pH range of 6.8–7.5 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Starr County?
Starr County has commercial agriculture that includes Cattle, Cotton, Wheat, Corn, Sorghum. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Starr County a good location for home gardening?
Starr County scores 44/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Gardening here benefits from close attention to frost timing and season extension due to the challenging microclimate factors.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Starr County gardeners in Zone 9b organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.
