Collin County, TX — Planting Guide
Collin County is in USDA Zone 8a. The average last spring frost is March 10 and the first fall frost is November 20, giving you a growing season of approximately 255 days.
At an elevation of 103 ft, Collin County receives approximately 65.2 in of rainfall annually. Summer highs average 94°F with winter lows around 41°F. The predominant soil type is Clay.
Based on 31 years of NOAA climate station data, the last frost date here varies by 58 days year to year — ranging from February 13 in warm years to April 11 in cold years. The growing season is trending longer by about 3.2 days per decade. Collin County scores 37/100 (Challenging) on the Microclimate Index.
🌡️ Zone
8a (10°F to 15°F min)
❄️ Last Frost
March 10
🍂 First Frost
November 20
📅 Growing Season
255 days
⛰️ Elevation
103 ft
🌧️ Annual Rainfall
65.2 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 | 1.8 in | 3 days | — | None |
| Feb | 2.2 in | 4 days | 2.1 in | High |
| Mar | 4.3 in | 5 days | — | Low |
| Apr | 6.9 in | 8 days | — | Low |
| May | 10.2 in | 9 days | — | Low |
| Jun | 9.9 in | 8 days | — | Low |
| Jul | 7.3 in | 7 days | — | Low |
| Aug | 8.4 in | 7 days | — | Low |
| Sep | 6.5 in | 6 days | — | Low |
| Oct | 3.9 in | 5 days | 0.4 in | Low |
| Nov | 2.2 in | 3 days | 2.1 in | High |
| Dec | 1.6 in | 4 days | — | None |
Annual total: 65.2 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.
Collin County Soil Profile
Soil Type
Clay
Soil pH
7.3-7.8
Drainage
Well Drained
Frost Risk Probability
Based on 31 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) | Apr 11 | Dec 7 | 240 days |
| Cautious | Mar 25 | Nov 27 | 247 days |
| Average year | Mar 10 | Nov 20 | 255 days |
| Optimistic | Mar 2 | Nov 11 | 254 days |
| Aggressive (risky) | Feb 13 | Nov 2 | 262 days |
Not very — frost dates can vary by ±58 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 3.2 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Collin County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Collin 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 Collin County's climate and soil.
County Extension Office
Collin 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 Collin County
Finding local nurseries & garden centers in Collin County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Collin 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 Collin County TX" or "garden center Collin 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 Collin County TX" or check your extension office and local parks department. Facebook groups like "Collin 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
14.2 hours
Summer solstice daylight
Shortest Day
9.8 hours
Winter solstice daylight
Peak Sun Hours
10.2 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: Day-neutral onion varieties like Candy, Cabernet, and Sierra Blanca perform best in your day-length range.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 10 hr | 5.7 hr | Short day |
| February | 10.8 hr | 6.1 hr | Short day |
| March | 11.8 hr | 7.1 hr | Short day |
| April | 12.8 hr | 7.7 hr | Neutral |
| May | 13.7 hr | 8.7 hr | Neutral |
| June | 14.2 hr | 9.6 hr | Long day |
| July | 14 hr | 10.2 hr | Long day |
| August | 13.2 hr | 9.5 hr | Neutral |
| September | 12.2 hr | 8.5 hr | Neutral |
| October | 11.2 hr | 7.3 hr | Short day |
| November | 10.3 hr | 5.9 hr | Short day |
| December | 9.8 hr | 5.3 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 | 47°F | 52°F | 🐢 Slow | ~24 weeks |
| Feb | 47°F | 51°F | 🐢 Slow | ~24 weeks |
| Mar | 54°F | 55°F | ♻️ Active | ~14 weeks |
| Apr | 63°F | 63°F | ♻️ Active | ~14 weeks |
| May | 74°F | 70°F | 🔥 Peak | ~8 weeks |
| Jun | 82°F | 78°F | 🔥 Peak | ~8 weeks |
| Jul | 89°F | 84°F | 🔥 Peak | ~8 weeks |
| Aug | 93°F | 88°F | 🔥 Peak | ~8 weeks |
| Sep | 87°F | 85°F | 🔥 Peak | ~8 weeks |
| Oct | 74°F | 77°F | 🔥 Peak | ~8 weeks |
| Nov | 62°F | 67°F | ♻️ Active | ~14 weeks |
| Dec | 51°F | 58°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 Collin 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 | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov |
| Squash vine borers | Moderate | May, Jun, Jul |
| Stink bugs | High | Apr, May, Jun, Jul, Aug, Sep, Oct |
| Whiteflies | Moderate | May, Jun, Jul, Aug, Sep, Oct |
| Spider mites | High | Jun, Jul, Aug, Sep |
| Fire ants | Moderate | Mar, Apr, May, Jun, Jul, Aug, Sep, Oct |
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 Collin 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 | Mar 20 | Sep 25 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Mar 14 | Sep 18 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Mar 17 | Sep 11 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Feb 13 | Sep 25 | ✓ 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 | Apr 4 | Oct 23 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (7 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Sep 28 | Feb 17 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Sep 17 | Feb 24 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Oct 1 | Feb 17 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Sep 6 | Feb 17 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Oct 22 | Feb 17 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 15 | Feb 24 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 17 | Feb 24 | — | Erosion control, weed suppression, good biomass |
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: 14 mph
Prevailing wind: S. Windy area — plant a windbreak hedge on the S side of your garden.
Windbreak Benefit
9.2/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
Moderate
Some terrain variation (228 ft range). Garden on slopes or higher ground if possible to avoid late-season frost pockets.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
32,495 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 1,250 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
May, Jun, Jul, Aug
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 65.2 inches of rain per year
- A 1,000 sq ft roof can collect roughly 32,495 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 Collin County
Soil Type
Clay
Soil pH 7.3–7.8 · Moderately Well Drained drainage
Raised beds strongly recommended here — native soil drainage or texture limits in-ground options.
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
255-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
Cedar raised bed kit — ideal for poor soil, clay, or small-space gardening.
Improve drainage and aeration in heavy clay soils with horticultural perlite.
Premium blend of topsoil, compost, and perlite formulated for raised beds.
🥬 Vegetables to Grow in Collin County
115 vegetables that grow well in Zone 8a with planting dates for Collin County.
Show all 115 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Feb 10 | Mar 17 | Mar 24 | Jun 16 – Jul 21 | 80–100 |
| Amaranth | Jan 20 | Mar 17 | Mar 24 | Jun 23 – Aug 11 | 90–120 |
| Artichoke | — | — | Mar 24 | Jul 28 – Oct 6 | 120–180 |
| Arugula | Feb 3 | Feb 24 | Mar 10 | Apr 14 – Jun 16 | 30–50 |
| Asparagus | — | — | Mar 24 | — | 730–1095 |
| Beets | — | Feb 24 | — | Apr 21 – May 19 | 50–70 |
| Belgian Endive | Feb 3 | Feb 24 | Mar 10 | Jun 30 – Aug 25 | 110–150 |
| Bitter Melon | Jan 20 | Mar 17 | Mar 24 | May 26 – Jul 7 | 60–90 |
| Black Beans | — | Mar 17 | — | Jun 16 – Aug 4 | 90–120 |
| Bok Choy | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 26 | 40–60 |
| Broccoli | Feb 3 | Feb 24 | Mar 10 | May 12 – Jun 23 | 60–90 |
| Broccoli Rabe | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 26 | 40–60 |
| Brussels Sprouts | Feb 3 | Feb 24 | Mar 10 | Jun 9 – Aug 4 | 90–130 |
| Butternut Squash | Feb 10 | Mar 17 | Mar 24 | Jun 23 – Jul 28 | 85–110 |
| Cabbage | Feb 3 | Feb 24 | Mar 10 | May 12 – Jul 7 | 60–100 |
| Calabash | Jan 20 | Mar 17 | Mar 24 | Jun 16 – Aug 11 | 80–120 |
| Cardoon | — | — | Mar 24 | Jul 28 – Sep 8 | 120–150 |
| Carrots | — | Feb 24 | — | Apr 28 – Jun 2 | 60–80 |
| Cauliflower | Feb 3 | Feb 24 | Mar 10 | May 5 – Jul 7 | 55–100 |
| Celeriac | Feb 3 | Feb 24 | Mar 10 | Jun 23 – Jul 28 | 100–120 |
| Celery | Feb 3 | Feb 24 | Mar 10 | Jun 2 – Jul 28 | 80–120 |
| Celtuce | Feb 3 | Feb 24 | Mar 10 | May 12 – Jun 23 | 60–90 |
| Chard | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 23 | 50–60 |
| Chayote | Jan 20 | Mar 17 | Mar 24 | Jul 28 – Oct 6 | 120–180 |
| Chickpeas | Feb 3 | Feb 24 | Mar 10 | Jun 2 – Jul 14 | 80–110 |
| Chicory | Feb 3 | Feb 24 | Mar 10 | May 12 – Jun 23 | 60–85 |
| Chinese Cabbage | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 2 | 50–70 |
| Christmas Lima Beans | Jan 20 | Mar 17 | Mar 24 | Jun 16 – Jul 21 | 80–100 |
| Collard Greens | Feb 3 | Feb 24 | Mar 10 | May 5 – Jul 7 | 55–75 |
| Corn | — | Mar 17 | — | May 19 – Jul 14 | 60–100 |
| Cowpeas | — | Mar 17 | — | May 19 – Jun 30 | 60–90 |
| Cress | Feb 3 | Feb 24 | Mar 10 | Mar 24 – Apr 14 | 14–21 |
| Crookneck Squash | Feb 10 | Mar 17 | Mar 24 | May 12 – Jun 9 | 45–60 |
| Crosne | — | Feb 24 | — | Jul 28 – Sep 29 | 150–200 |
| Cucumber | Feb 10 | Mar 17 | Mar 24 | May 19 – Jul 14 | 50–70 |
| Daikon | — | Feb 24 | — | Apr 21 – May 19 | 50–70 |
| Delicata Squash | Feb 10 | Mar 17 | Mar 24 | Jun 16 – Jul 21 | 80–100 |
| Edamame | — | Mar 17 | — | Jun 2 – Jul 14 | 75–100 |
| Eggplant | Jan 6 | Mar 17 | Mar 24 | Jun 2 – Aug 4 | 65–85 |
| Endive | Feb 3 | Feb 24 | Mar 10 | Apr 28 – Jun 2 | 45–65 |
| Escarole | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 2 | 50–70 |
| Fava Beans | Feb 3 | Feb 24 | Mar 10 | May 26 – Jul 7 | 75–100 |
| Fennel | Jan 20 | Mar 17 | Mar 24 | May 26 – Jul 7 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Ginger | Jan 20 | Mar 17 | Mar 24 | Nov 24 – Dec 8 | 240–300 |
| Green Beans | — | Mar 17 | — | May 12 – Jul 7 | 50–65 |
| Horseradish | — | — | Mar 24 | Jul 28 – Oct 6 | 120–180 |
| Hot Peppers | Jan 6 | Mar 17 | Mar 24 | Jun 2 – Sep 8 | 70–120 |
| Hubbard Squash | Feb 10 | Mar 17 | Mar 24 | Jul 7 – Aug 11 | 100–120 |
| Jicama | Jan 20 | Mar 17 | Mar 24 | Jul 28 – Oct 6 | 120–180 |
| Kabocha | Feb 10 | Mar 17 | Mar 24 | Jun 23 – Jul 21 | 85–100 |
| Kai Lan | Feb 3 | Feb 24 | Mar 10 | Apr 28 – May 26 | 45–60 |
| Kale | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 30 | 50–70 |
| Kidney Beans | — | Mar 17 | — | Jun 16 – Jul 21 | 85–110 |
| Kohlrabi | Feb 3 | Feb 24 | Mar 10 | Apr 28 – Jun 2 | 45–65 |
| Komatsuna | Feb 3 | Feb 24 | Mar 10 | Apr 14 – May 19 | 35–50 |
| Leeks | Feb 3 | Feb 24 | Mar 10 | Jun 9 – Aug 25 | 90–150 |
| Lentils | Feb 3 | Feb 24 | Mar 10 | Jun 2 – Jul 14 | 80–110 |
| Lettuce | Feb 3 | Feb 24 | Mar 10 | Apr 14 – Jun 23 | 30–60 |
| Lima Beans | — | Mar 17 | — | May 19 – Jun 30 | 60–90 |
| Loofah | Jan 20 | Mar 17 | Mar 24 | Jul 7 – Sep 8 | 100–150 |
| Luffa | Jan 20 | Mar 17 | Mar 24 | Jun 23 – Sep 8 | 90–150 |
| Mache | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 26 | 40–60 |
| Malabar Spinach | Jan 20 | Mar 17 | Mar 24 | May 19 – Jun 16 | 55–70 |
| Melon | Feb 10 | Mar 17 | Mar 24 | Jun 2 – Jul 21 | 70–100 |
| Microgreens | Feb 3 | Feb 24 | Mar 10 | Mar 17 – Apr 14 | 7–21 |
| Mitsuba | Feb 3 | Feb 24 | Mar 3 | Apr 28 – Jun 23 | 50–70 |
| Mizuna | Feb 3 | Feb 24 | Mar 10 | Apr 14 – May 12 | 30–45 |
| Mustard Greens | Feb 3 | Feb 24 | Mar 10 | Apr 14 – Jun 16 | 30–50 |
| Napa Cabbage | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 9 | 55–75 |
| New Zealand Spinach | Jan 20 | Mar 17 | Mar 24 | May 19 – Jun 16 | 55–70 |
| Okra | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 14 | 50–65 |
| Onion | Feb 3 | Feb 24 | Mar 10 | Jun 9 – Jul 28 | 90–120 |
| Pac Choi | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 19 | 40–55 |
| Parsnip | — | Feb 24 | — | Jun 9 – Jul 21 | 100–130 |
| Patty Pan Squash | Feb 10 | Mar 17 | Mar 24 | May 12 – Jun 9 | 45–60 |
| Peas | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 30 | 55–70 |
| Peppers | Jan 6 | Mar 17 | Mar 24 | May 26 – Aug 4 | 60–90 |
| Pole Beans | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 14 | 55–70 |
| Potatoes | Jan 20 | Mar 17 | Mar 24 | Jun 2 – Aug 11 | 70–120 |
| Pumpkin | Feb 10 | Mar 17 | Mar 24 | Jun 23 – Aug 11 | 85–120 |
| Purslane | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 26 | 40–60 |
| Radicchio | Feb 3 | Feb 24 | Mar 10 | May 12 – Jun 16 | 60–80 |
| Radish | — | Feb 24 | — | Mar 24 – Apr 14 | 22–35 |
| Rhubarb | — | — | Mar 31 | — | 365–730 |
| Romanesco | Feb 3 | Feb 24 | Mar 10 | May 26 – Jul 7 | 75–100 |
| Rutabaga | — | Feb 24 | — | May 19 – Jun 23 | 80–100 |
| Salsify | — | Feb 24 | — | Jun 9 – Jul 21 | 100–130 |
| Savoy Cabbage | Feb 3 | Feb 24 | Mar 10 | May 19 – Jul 14 | 70–110 |
| Scallions | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 2 | 50–70 |
| Scarlet Runner Beans | Jan 20 | Mar 17 | Mar 24 | May 26 – Jun 30 | 60–80 |
| Shallot | Feb 3 | Feb 24 | Mar 10 | Jun 9 – Jul 28 | 90–120 |
| Shiso | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 14 | 50–70 |
| Snap Peas | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 14 | 55–70 |
| Snow Peas | Feb 3 | Feb 24 | Mar 10 | May 5 – Jun 30 | 50–65 |
| Soybeans | — | Mar 17 | — | Jun 9 – Aug 4 | 80–120 |
| Spaghetti Squash | Feb 10 | Mar 17 | Mar 24 | Jun 23 – Jul 21 | 85–100 |
| Spinach | Feb 3 | Feb 24 | Mar 10 | Apr 14 – Jun 16 | 35–50 |
| Squash (Summer) | Feb 10 | Mar 17 | Mar 24 | May 12 – Jul 14 | 45–65 |
| Squash (Winter) | Feb 10 | Mar 17 | Mar 24 | Jun 16 – Aug 11 | 80–120 |
| Sunchoke | — | — | Mar 24 | Jul 14 – Sep 8 | 110–150 |
| Sunflower | Jan 20 | Mar 17 | Mar 24 | Jun 2 – Jul 21 | 70–100 |
| Sweet Corn | — | Mar 17 | — | May 19 – Jun 30 | 60–90 |
| Sweet Potatoes | Jan 20 | Mar 17 | Mar 24 | Jun 23 – Aug 11 | 90–120 |
| Tatsoi | Feb 3 | Feb 24 | Mar 10 | Apr 14 – May 19 | 35–50 |
| Tomatillo | Jan 20 | Mar 17 | Mar 24 | May 26 – Aug 4 | 60–85 |
| Tomatoes | Jan 20 | Mar 17 | Mar 24 | May 26 – Aug 4 | 60–85 |
| Turmeric | Jan 20 | Mar 17 | Mar 24 | Nov 24 – Dec 8 | 240–300 |
| Turnip | — | Feb 24 | — | Apr 7 – May 12 | 40–60 |
| Watercress | Feb 3 | Feb 24 | Mar 10 | Apr 21 – May 26 | 40–60 |
| Watermelon | Feb 10 | Mar 17 | Mar 24 | Jun 2 – Jul 21 | 70–100 |
| Wax Beans | — | Mar 17 | — | May 12 – Jul 7 | 50–65 |
| Winter Melon | Jan 20 | Mar 17 | Mar 24 | Jun 23 – Aug 11 | 90–120 |
| Yard Long Beans | Jan 20 | Mar 17 | Mar 24 | May 19 – Jun 30 | 55–80 |
| Zucchini | Feb 10 | Mar 17 | Mar 24 | May 12 – Jul 7 | 45–60 |
🍓 Fruits to Grow in Collin County
27 fruits that grow well in Zone 8a with planting dates for Collin County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Mar 31 | Jun 30 – Oct 13 | 90–180 |
| Aronia | — | — | Mar 31 | — | 730–1095 |
| Blackberries | — | — | Mar 31 | — | 365–730 |
| Blueberries | — | — | Mar 31 | — | 730–1095 |
| Boysenberries | — | — | Mar 31 | — | 365–730 |
| Cantaloupe | — | — | Mar 31 | Jun 9 – Jul 14 | 70–90 |
| Che Fruit | — | — | Mar 31 | — | 1095–1825 |
| Elderberries | — | — | Mar 31 | — | 730–1095 |
| Figs | — | — | Mar 31 | — | 730–1825 |
| Goji Berries | — | — | Mar 31 | — | 730–1095 |
| Gooseberries | — | — | Mar 31 | — | 730–1095 |
| Grapes | — | — | Mar 31 | — | 730–1095 |
| Ground Cherry | — | — | Mar 31 | Jun 9 – Aug 4 | 65–80 |
| Hardy Kiwi | — | — | Mar 31 | — | 1095–1825 |
| Honeydew | — | — | Mar 31 | Jun 23 – Aug 4 | 80–110 |
| Jostaberry | — | — | Mar 31 | — | 730–1095 |
| Kiwi | — | — | Mar 31 | — | 1095–1825 |
| Loquat | — | — | Mar 31 | — | 730–1825 |
| Medlar | — | — | Mar 31 | — | 1095–1825 |
| Mulberries | — | — | Mar 31 | — | 730–1825 |
| Pawpaw | — | — | Mar 31 | — | 1095–2555 |
| Persimmon | — | — | Mar 31 | — | 1095–2555 |
| Pomegranate | — | — | Mar 31 | — | 730–1095 |
| Quince | — | — | Mar 31 | — | 1095–1825 |
| Raspberries | — | — | Mar 31 | — | 365–730 |
| Serviceberries | — | — | Mar 31 | — | 730–1095 |
| Strawberries | — | — | Mar 31 | Jun 30 – Dec 15 | 90–365 |
🌿 Herbs to Grow in Collin County
42 herbs that grow well in Zone 8a with planting dates for Collin County.
Show all 42 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Feb 3 | Feb 24 | Mar 3 | — | 365–730 |
| Anise | Feb 3 | Feb 24 | Mar 3 | Jun 2 – Aug 18 | 90–120 |
| Basil | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 21 | 50–75 |
| Bee Balm | — | — | Mar 17 | Jun 16 – Sep 1 | 90–120 |
| Borage | Feb 3 | Feb 24 | Mar 3 | Apr 28 – Jun 16 | 50–60 |
| Caraway | Feb 3 | Feb 24 | Mar 3 | — | 365–450 |
| Catnip | — | — | Mar 17 | May 19 – Jul 21 | 60–80 |
| Chamomile | Feb 3 | Feb 24 | Mar 3 | May 5 – Jul 14 | 60–90 |
| Chervil | Feb 3 | Feb 24 | Mar 3 | Apr 14 – Jun 16 | 40–60 |
| Chives | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Cilantro | Feb 3 | Feb 24 | Mar 3 | Apr 14 – Jun 16 | 40–60 |
| Comfrey | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Cumin | Feb 3 | Feb 24 | Mar 3 | Jun 16 – Aug 18 | 100–120 |
| Dill | Feb 3 | Feb 24 | Mar 3 | Apr 14 – Jun 16 | 40–60 |
| Echinacea | — | — | Mar 17 | Jul 21 – Oct 27 | 120–180 |
| Epazote | Jan 20 | Mar 17 | Mar 24 | May 12 – Jul 7 | 45–60 |
| Fennel (herb) | Feb 3 | Feb 24 | Mar 3 | May 5 – Jul 14 | 60–90 |
| Feverfew | — | — | Mar 17 | Jun 16 – Sep 1 | 90–120 |
| Garlic Chives | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Horehound | — | — | Mar 17 | Jun 2 – Jul 28 | 75–90 |
| Hyssop | — | — | Mar 17 | May 26 – Jul 28 | 70–90 |
| Lavender | — | — | Mar 17 | Jun 16 – Nov 17 | 90–200 |
| Lemon Balm | — | — | Mar 17 | May 19 – Jul 7 | 60–70 |
| Lemon Thyme | — | — | Mar 17 | May 26 – Jul 28 | 70–90 |
| Lemon Verbena | Jan 20 | Mar 17 | Mar 24 | May 26 – Aug 4 | 60–90 |
| Lemongrass | Jan 20 | Mar 17 | Mar 24 | Jun 9 – Sep 8 | 75–120 |
| Lovage | — | — | Mar 17 | May 26 – Jul 28 | 70–90 |
| Marjoram | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Mint | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Oregano | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Parsley | Feb 3 | Feb 24 | Mar 3 | May 5 – Jul 7 | 60–80 |
| Rosemary | — | — | Mar 17 | Jun 9 – Oct 27 | 80–180 |
| Rue | — | — | Mar 17 | May 26 – Jul 28 | 70–90 |
| Sage | — | — | Mar 17 | Jun 2 – Jul 28 | 75–90 |
| Savory | — | — | Mar 17 | May 12 – Jul 7 | 50–70 |
| Sorrel | Feb 3 | Feb 24 | Mar 3 | Apr 14 – Jun 16 | 40–60 |
| Stevia | Jan 20 | Mar 17 | Mar 24 | May 26 – Aug 4 | 60–90 |
| Tarragon | — | — | Mar 17 | May 19 – Jul 28 | 60–90 |
| Thai Basil | Jan 20 | Mar 17 | Mar 24 | May 19 – Jul 21 | 50–75 |
| Thyme | — | — | Mar 17 | May 26 – Jul 28 | 70–90 |
| Valerian | — | — | Mar 17 | Jul 21 – Oct 27 | 120–180 |
| Yarrow | — | — | Mar 17 | Jun 16 – Sep 1 | 90–120 |
Monthly Planting Guide for Collin County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Collin County.
Frequently Asked Questions
What planting zone is Collin County, TX?
Collin County is in USDA Hardiness Zone 8a. 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 Collin County, TX?
Based on 31 years of NOAA weather station data, the median last spring frost in Collin County falls around March 10. In 8 out of 10 years, last frost lands between February 13 and April 11 — a 58-day window of variability. Use April 11 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Collin County, TX?
The median first fall frost in Collin County arrives around November 20. In cold years it can arrive as early as November 2; in mild years as late as December 7. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Collin County?
Collin County has a frost-free growing season of approximately 255 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 3.2 days per decade.
What is the soil like in Collin County for gardening?
Collin County has predominantly Clay soil with a pH range of 7.3–7.8 and Moderately Well Drained drainage. The native soil conditions make raised beds a particularly good investment here — they let you control drainage and fertility independent of the ground soil.
What is grown commercially in Collin County?
Collin County has commercial agriculture that includes Cotton, Cattle, Sorghum, Wheat, Hay. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Collin County a good location for home gardening?
Collin County scores 37/100 (Challenging) 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 Collin County gardeners in Zone 8a 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.
