Fairfax County, VA — Planting Guide
Fairfax County is in USDA Zone 7a. The average last spring frost is April 6 and the first fall frost is November 3, giving you a growing season of approximately 211 days.
At an elevation of 548 ft, Fairfax County receives approximately 53 in of rainfall annually. Summer highs average 93°F with winter lows around 31°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 36 days year to year — ranging from March 19 in warm years to April 25 in cold years. The growing season is trending longer by about 3.68 days per decade. Fairfax County scores 54/100 (Moderate) on the Microclimate Index.
🌡️ Zone
7a (0°F to 5°F min)
❄️ Last Frost
April 6
🍂 First Frost
November 3
📅 Growing Season
211 days
⛰️ Elevation
548 ft
🌧️ Annual Rainfall
53 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 | 4.1 in | 8 days | — | None |
| Feb | 4.6 in | 8 days | — | None |
| Mar | 5.5 in | 9 days | — | Low |
| Apr | 4.1 in | 6 days | 0.2 in | Low |
| May | 3.8 in | 7 days | 0.5 in | Low |
| Jun | 5 in | 11 days | — | Low |
| Jul | 5.9 in | 13 days | — | Low |
| Aug | 4.1 in | 11 days | 0.2 in | Low |
| Sep | 3.8 in | 7 days | 0.5 in | Low |
| Oct | 3.3 in | 7 days | 1 in | Moderate |
| Nov | 4.4 in | 8 days | — | None |
| Dec | 4.4 in | 8 days | — | None |
Annual total: 53 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.
Fairfax County Soil Profile
Soil Type
Silt Loam
Soil pH
5.4-6.5
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 25 | Nov 23 | 212 days |
| Cautious | Apr 14 | Nov 10 | 210 days |
| Average year | Apr 6 | Nov 3 | 211 days |
| Optimistic | Mar 27 | Oct 25 | 212 days |
| Aggressive (risky) | Mar 19 | Oct 14 | 209 days |
Not very — frost dates can vary by ±36 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 3.7 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Fairfax County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Fairfax 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 Fairfax County's climate and soil.
County Extension Office
Fairfax County Virginia Cooperative Extension (Virginia Tech / Virginia State) Extension Office
Phone: 540-231-5299
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 Fairfax County
Finding local nurseries & garden centers in Fairfax County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Fairfax 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 Fairfax County VA" or "garden center Fairfax 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 Fairfax County VA" or check your extension office and local parks department. Facebook groups like "Fairfax County Gardeners" or "Virginia 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
14.7 hours
Summer solstice daylight
Shortest Day
9.3 hours
Winter solstice daylight
Peak Sun Hours
9.1 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 long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.6 hr | 4.7 hr | Short day |
| February | 10.5 hr | 5.2 hr | Short day |
| March | 11.7 hr | 6.7 hr | Short day |
| April | 13 hr | 7.6 hr | Neutral |
| May | 14.1 hr | 9.1 hr | Long day |
| June | 14.7 hr | 8.4 hr | Long day |
| July | 14.5 hr | 8.2 hr | Long day |
| August | 13.5 hr | 7.1 hr | Neutral |
| September | 12.2 hr | 7 hr | Neutral |
| October | 11 hr | 6.5 hr | Short day |
| November | 9.8 hr | 5.6 hr | Short day |
| December | 9.3 hr | 4.5 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 May through Oct.
Best Month to Compost
May
Microbial activity peaks when soil is warm.
Active Composting
8 months
Nearly year-round composting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 38°F | 44°F | ❄️ Dormant | ~36 weeks |
| Feb | 40°F | 43°F | 🐢 Slow | ~24 weeks |
| Mar | 48°F | 48°F | 🐢 Slow | ~24 weeks |
| Apr | 58°F | 55°F | ♻️ Active | ~14 weeks |
| May | 67°F | 64°F | 🔥 Peak | ~8 weeks |
| Jun | 79°F | 74°F | 🔥 Peak | ~8 weeks |
| Jul | 87°F | 81°F | 🔥 Peak | ~8 weeks |
| Aug | 85°F | 83°F | 🔥 Peak | ~8 weeks |
| Sep | 80°F | 79°F | 🔥 Peak | ~8 weeks |
| Oct | 69°F | 72°F | 🔥 Peak | ~8 weeks |
| Nov | 57°F | 62°F | ♻️ Active | ~14 weeks |
| Dec | 45°F | 51°F | 🐢 Slow | ~24 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Fairfax County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
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 |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash vine borers | High | May, Jun, Jul |
| Stink bugs | Moderate | May, Jun, Jul, Aug, Sep |
| Whiteflies | Moderate | Jun, Jul, Aug, Sep |
| Spider mites | Moderate | Jul, Aug |
Organic pest management tips
- Use row covers on susceptible crops during peak pest months
- Apply neem oil preventatively every 7-14 days during active pest season
- Interplant with strong-scented herbs (basil, marigold) to confuse pests
- Hand-pick larger pests (beetles, caterpillars) in early morning when they're sluggish
- Practice crop rotation — never plant the same family in the same spot within 3 years
- Watch for powdery mildew, downy mildew, blight — common in your climate
Cover Crops for Fairfax 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 | Apr 13 | Sep 8 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Cowpeas (southern peas) | Apr 13 | Aug 25 | ✓ Yes | Excellent nitrogen fixer for warm climates, edible |
| Sorghum-sudan grass | Apr 13 | Sep 1 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 10 | Aug 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 30 | Oct 13 | — | 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 | Aug 28 | Mar 16 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Crimson clover | Aug 25 | Mar 23 | ✓ Yes | Fixes nitrogen, attracts pollinators in spring |
| Daikon radish | Sep 16 | Mar 23 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 24 | Mar 23 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 24 | Mar 16 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Aug 12 | Mar 16 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Aug 5 | Mar 23 | — | 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: 11 mph Summer: 7 mph
Fall: 9 mph Winter: 10 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (299 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
26,415 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 250 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Feb, Mar, Jun, Jul
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
May, Sep, Oct
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 53.0 inches of rain per year
- A 1,000 sq ft roof can collect roughly 26,415 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 Fairfax County
Soil Type
Silt Loam
Soil pH 5.4–6.5 · Moderately Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (53 in. annual rainfall)
Season Tips
211-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
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
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Fairfax County
113 vegetables that grow well in Zone 7a with planting dates for Fairfax County.
Show all 113 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 9 | Apr 13 | Apr 20 | Jul 13 – Aug 17 | 80–100 |
| Amaranth | Feb 16 | Apr 13 | Apr 20 | Jul 20 – Sep 7 | 90–120 |
| Artichoke | — | — | Apr 20 | Aug 24 – Nov 2 | 120–180 |
| Arugula | Mar 2 | Mar 23 | Apr 6 | May 11 – Jul 13 | 30–50 |
| Asparagus | — | — | Apr 20 | — | 730–1095 |
| Beets | — | Mar 23 | — | May 18 – Jun 15 | 50–70 |
| Belgian Endive | Mar 2 | Mar 23 | Apr 6 | Jul 27 – Sep 21 | 110–150 |
| Bitter Melon | Feb 16 | Apr 13 | Apr 20 | Jun 22 – Aug 3 | 60–90 |
| Black Beans | — | Apr 13 | — | Jul 13 – Aug 31 | 90–120 |
| Bok Choy | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 22 | 40–60 |
| Broccoli | Mar 2 | Mar 23 | Apr 6 | Jun 8 – Jul 20 | 60–90 |
| Broccoli Rabe | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 22 | 40–60 |
| Brussels Sprouts | Mar 2 | Mar 23 | Apr 6 | Jul 6 – Aug 31 | 90–130 |
| Butternut Squash | Mar 9 | Apr 13 | Apr 20 | Jul 20 – Aug 24 | 85–110 |
| Cabbage | Mar 2 | Mar 23 | Apr 6 | Jun 8 – Aug 3 | 60–100 |
| Calabash | Feb 16 | Apr 13 | Apr 20 | Jul 13 – Sep 7 | 80–120 |
| Cardoon | — | — | Apr 20 | Aug 24 – Oct 5 | 120–150 |
| Carrots | — | Mar 23 | — | May 25 – Jun 29 | 60–80 |
| Cauliflower | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Aug 3 | 55–100 |
| Celeriac | Mar 2 | Mar 23 | Apr 6 | Jul 20 – Aug 24 | 100–120 |
| Celery | Mar 2 | Mar 23 | Apr 6 | Jun 29 – Aug 24 | 80–120 |
| Celtuce | Mar 2 | Mar 23 | Apr 6 | Jun 8 – Jul 20 | 60–90 |
| Chard | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jul 20 | 50–60 |
| Chayote | Feb 16 | Apr 13 | Apr 20 | Aug 24 – Nov 2 | 120–180 |
| Chickpeas | Mar 2 | Mar 23 | Apr 6 | Jun 29 – Aug 10 | 80–110 |
| Chicory | Mar 2 | Mar 23 | Apr 6 | Jun 8 – Jul 20 | 60–85 |
| Chinese Cabbage | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jun 29 | 50–70 |
| Christmas Lima Beans | Feb 16 | Apr 13 | Apr 20 | Jul 13 – Aug 17 | 80–100 |
| Collard Greens | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Aug 3 | 55–75 |
| Corn | — | Apr 13 | — | Jun 15 – Aug 10 | 60–100 |
| Cowpeas | — | Apr 13 | — | Jun 15 – Jul 27 | 60–90 |
| Cress | Mar 2 | Mar 23 | Apr 6 | Apr 20 – May 11 | 14–21 |
| Crookneck Squash | Mar 9 | Apr 13 | Apr 20 | Jun 8 – Jul 6 | 45–60 |
| Crosne | — | Mar 23 | — | Aug 24 – Oct 26 | 150–200 |
| Cucumber | Mar 9 | Apr 13 | Apr 20 | Jun 15 – Aug 10 | 50–70 |
| Daikon | — | Mar 23 | — | May 18 – Jun 15 | 50–70 |
| Delicata Squash | Mar 9 | Apr 13 | Apr 20 | Jul 13 – Aug 17 | 80–100 |
| Edamame | — | Apr 13 | — | Jun 29 – Aug 10 | 75–100 |
| Eggplant | Feb 2 | Apr 13 | Apr 20 | Jun 29 – Aug 31 | 65–85 |
| Endive | Mar 2 | Mar 23 | Apr 6 | May 25 – Jun 29 | 45–65 |
| Escarole | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jun 29 | 50–70 |
| Fava Beans | Mar 2 | Mar 23 | Apr 6 | Jun 22 – Aug 3 | 75–100 |
| Fennel | Feb 16 | Apr 13 | Apr 20 | Jun 22 – Aug 3 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Apr 13 | — | Jun 8 – Aug 3 | 50–65 |
| Horseradish | — | — | Apr 20 | Aug 24 – Nov 2 | 120–180 |
| Hot Peppers | Feb 2 | Apr 13 | Apr 20 | Jun 29 – Oct 5 | 70–120 |
| Hubbard Squash | Mar 9 | Apr 13 | Apr 20 | Aug 3 – Sep 7 | 100–120 |
| Jicama | Feb 16 | Apr 13 | Apr 20 | Aug 24 – Nov 2 | 120–180 |
| Kabocha | Mar 9 | Apr 13 | Apr 20 | Jul 20 – Aug 17 | 85–100 |
| Kai Lan | Mar 2 | Mar 23 | Apr 6 | May 25 – Jun 22 | 45–60 |
| Kale | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jul 27 | 50–70 |
| Kidney Beans | — | Apr 13 | — | Jul 13 – Aug 17 | 85–110 |
| Kohlrabi | Mar 2 | Mar 23 | Apr 6 | May 25 – Jun 29 | 45–65 |
| Komatsuna | Mar 2 | Mar 23 | Apr 6 | May 11 – Jun 15 | 35–50 |
| Leeks | Mar 2 | Mar 23 | Apr 6 | Jul 6 – Sep 21 | 90–150 |
| Lentils | Mar 2 | Mar 23 | Apr 6 | Jun 29 – Aug 10 | 80–110 |
| Lettuce | Mar 2 | Mar 23 | Apr 6 | May 11 – Jul 20 | 30–60 |
| Lima Beans | — | Apr 13 | — | Jun 15 – Jul 27 | 60–90 |
| Loofah | Feb 16 | Apr 13 | Apr 20 | Aug 3 – Oct 5 | 100–150 |
| Luffa | Feb 16 | Apr 13 | Apr 20 | Jul 20 – Oct 5 | 90–150 |
| Mache | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 22 | 40–60 |
| Malabar Spinach | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Jul 13 | 55–70 |
| Melon | Mar 9 | Apr 13 | Apr 20 | Jun 29 – Aug 17 | 70–100 |
| Microgreens | Mar 2 | Mar 23 | Apr 6 | Apr 13 – May 11 | 7–21 |
| Mitsuba | Mar 2 | Mar 23 | Mar 30 | May 25 – Jul 20 | 50–70 |
| Mizuna | Mar 2 | Mar 23 | Apr 6 | May 11 – Jun 8 | 30–45 |
| Mustard Greens | Mar 2 | Mar 23 | Apr 6 | May 11 – Jul 13 | 30–50 |
| Napa Cabbage | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jul 6 | 55–75 |
| New Zealand Spinach | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Jul 13 | 55–70 |
| Okra | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 10 | 50–65 |
| Onion | Mar 2 | Mar 23 | Apr 6 | Jul 6 – Aug 24 | 90–120 |
| Pac Choi | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 15 | 40–55 |
| Parsnip | — | Mar 23 | — | Jul 6 – Aug 17 | 100–130 |
| Patty Pan Squash | Mar 9 | Apr 13 | Apr 20 | Jun 8 – Jul 6 | 45–60 |
| Peas | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jul 27 | 55–70 |
| Peppers | Feb 2 | Apr 13 | Apr 20 | Jun 22 – Aug 31 | 60–90 |
| Pole Beans | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 10 | 55–70 |
| Potatoes | Feb 16 | Apr 13 | Apr 20 | Jun 29 – Sep 7 | 70–120 |
| Pumpkin | Mar 9 | Apr 13 | Apr 20 | Jul 20 – Sep 7 | 85–120 |
| Purslane | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 22 | 40–60 |
| Radicchio | Mar 2 | Mar 23 | Apr 6 | Jun 8 – Jul 13 | 60–80 |
| Radish | — | Mar 23 | — | Apr 20 – May 11 | 22–35 |
| Rhubarb | — | — | Apr 27 | — | 365–730 |
| Romanesco | Mar 2 | Mar 23 | Apr 6 | Jun 22 – Aug 3 | 75–100 |
| Rutabaga | — | Mar 23 | — | Jun 15 – Jul 20 | 80–100 |
| Salsify | — | Mar 23 | — | Jul 6 – Aug 17 | 100–130 |
| Savoy Cabbage | Mar 2 | Mar 23 | Apr 6 | Jun 15 – Aug 10 | 70–110 |
| Scallions | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jun 29 | 50–70 |
| Scarlet Runner Beans | Feb 16 | Apr 13 | Apr 20 | Jun 22 – Jul 27 | 60–80 |
| Shallot | Mar 2 | Mar 23 | Apr 6 | Jul 6 – Aug 24 | 90–120 |
| Shiso | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 10 | 50–70 |
| Snap Peas | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 10 | 55–70 |
| Snow Peas | Mar 2 | Mar 23 | Apr 6 | Jun 1 – Jul 27 | 50–65 |
| Soybeans | — | Apr 13 | — | Jul 6 – Aug 31 | 80–120 |
| Spaghetti Squash | Mar 9 | Apr 13 | Apr 20 | Jul 20 – Aug 17 | 85–100 |
| Spinach | Mar 2 | Mar 23 | Apr 6 | May 11 – Jul 13 | 35–50 |
| Squash (Summer) | Mar 9 | Apr 13 | Apr 20 | Jun 8 – Aug 10 | 45–65 |
| Squash (Winter) | Mar 9 | Apr 13 | Apr 20 | Jul 13 – Sep 7 | 80–120 |
| Sunchoke | — | — | Apr 20 | Aug 10 – Oct 5 | 110–150 |
| Sunflower | Feb 16 | Apr 13 | Apr 20 | Jun 29 – Aug 17 | 70–100 |
| Sweet Corn | — | Apr 13 | — | Jun 15 – Jul 27 | 60–90 |
| Sweet Potatoes | Feb 16 | Apr 13 | Apr 20 | Jul 20 – Sep 7 | 90–120 |
| Tatsoi | Mar 2 | Mar 23 | Apr 6 | May 11 – Jun 15 | 35–50 |
| Tomatillo | Feb 16 | Apr 13 | Apr 20 | Jun 22 – Aug 31 | 60–85 |
| Tomatoes | Feb 16 | Apr 13 | Apr 20 | Jun 22 – Aug 31 | 60–85 |
| Turnip | — | Mar 23 | — | May 4 – Jun 8 | 40–60 |
| Watercress | Mar 2 | Mar 23 | Apr 6 | May 18 – Jun 22 | 40–60 |
| Watermelon | Mar 9 | Apr 13 | Apr 20 | Jun 29 – Aug 17 | 70–100 |
| Wax Beans | — | Apr 13 | — | Jun 8 – Aug 3 | 50–65 |
| Winter Melon | Feb 16 | Apr 13 | Apr 20 | Jul 20 – Sep 7 | 90–120 |
| Yard Long Beans | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Jul 27 | 55–80 |
| Zucchini | Mar 9 | Apr 13 | Apr 20 | Jun 8 – Aug 3 | 45–60 |
🍓 Fruits to Grow in Fairfax County
31 fruits that grow well in Zone 7a with planting dates for Fairfax County.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Apr 27 | Jul 27 – Nov 9 | 90–180 |
| Aronia | — | — | Apr 27 | — | 730–1095 |
| Blackberries | — | — | Apr 27 | — | 365–730 |
| Blueberries | — | — | Apr 27 | — | 730–1095 |
| Boysenberries | — | — | Apr 27 | — | 365–730 |
| Cantaloupe | — | — | Apr 27 | Jul 6 – Aug 10 | 70–90 |
| Che Fruit | — | — | Apr 27 | — | 1095–1825 |
| Cranberries | — | — | Apr 27 | — | 730–1095 |
| Currants | — | — | Apr 27 | — | 730–1095 |
| Elderberries | — | — | Apr 27 | — | 730–1095 |
| Figs | — | — | Apr 27 | — | 730–1825 |
| Goji Berries | — | — | Apr 27 | — | 730–1095 |
| Gooseberries | — | — | Apr 27 | — | 730–1095 |
| Grapes | — | — | Apr 27 | — | 730–1095 |
| Ground Cherry | — | — | Apr 27 | Jul 6 – Aug 31 | 65–80 |
| Hardy Kiwi | — | — | Apr 27 | — | 1095–1825 |
| Haskaps | — | — | Apr 27 | — | 730–1095 |
| Honeydew | — | — | Apr 27 | Jul 20 – Aug 31 | 80–110 |
| Jostaberry | — | — | Apr 27 | — | 730–1095 |
| Kiwi | — | — | Apr 27 | — | 1095–1825 |
| Lingonberries | — | — | Apr 27 | — | 730–1095 |
| Loquat | — | — | Apr 27 | — | 730–1825 |
| Medlar | — | — | Apr 27 | — | 1095–1825 |
| Mulberries | — | — | Apr 27 | — | 730–1825 |
| Pawpaw | — | — | Apr 27 | — | 1095–2555 |
| Persimmon | — | — | Apr 27 | — | 1095–2555 |
| Pomegranate | — | — | Apr 27 | — | 730–1095 |
| Quince | — | — | Apr 27 | — | 1095–1825 |
| Raspberries | — | — | Apr 27 | — | 365–730 |
| Serviceberries | — | — | Apr 27 | — | 730–1095 |
| Strawberries | — | — | Apr 27 | Jul 27 – Dec 7 | 90–365 |
🌿 Herbs to Grow in Fairfax County
39 herbs that grow well in Zone 7a with planting dates for Fairfax County.
Show all 39 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 2 | Mar 23 | Mar 30 | — | 365–730 |
| Anise | Mar 2 | Mar 23 | Mar 30 | Jun 29 – Sep 14 | 90–120 |
| Basil | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 17 | 50–75 |
| Bee Balm | — | — | Apr 13 | Jul 13 – Sep 28 | 90–120 |
| Borage | Mar 2 | Mar 23 | Mar 30 | May 25 – Jul 13 | 50–60 |
| Caraway | Mar 2 | Mar 23 | Mar 30 | — | 365–450 |
| Catnip | — | — | Apr 13 | Jun 15 – Aug 17 | 60–80 |
| Chamomile | Mar 2 | Mar 23 | Mar 30 | Jun 1 – Aug 10 | 60–90 |
| Chervil | Mar 2 | Mar 23 | Mar 30 | May 11 – Jul 13 | 40–60 |
| Chives | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Cilantro | Mar 2 | Mar 23 | Mar 30 | May 11 – Jul 13 | 40–60 |
| Comfrey | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Cumin | Mar 2 | Mar 23 | Mar 30 | Jul 13 – Sep 14 | 100–120 |
| Dill | Mar 2 | Mar 23 | Mar 30 | May 11 – Jul 13 | 40–60 |
| Echinacea | — | — | Apr 13 | Aug 17 – Nov 23 | 120–180 |
| Epazote | Feb 16 | Apr 13 | Apr 20 | Jun 8 – Aug 3 | 45–60 |
| Fennel (herb) | Mar 2 | Mar 23 | Mar 30 | Jun 1 – Aug 10 | 60–90 |
| Feverfew | — | — | Apr 13 | Jul 13 – Sep 28 | 90–120 |
| Garlic Chives | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Horehound | — | — | Apr 13 | Jun 29 – Aug 24 | 75–90 |
| Hyssop | — | — | Apr 13 | Jun 22 – Aug 24 | 70–90 |
| Lavender | — | — | Apr 13 | Jul 13 – Nov 23 | 90–200 |
| Lemon Balm | — | — | Apr 13 | Jun 15 – Aug 3 | 60–70 |
| Lemon Thyme | — | — | Apr 13 | Jun 22 – Aug 24 | 70–90 |
| Lovage | — | — | Apr 13 | Jun 22 – Aug 24 | 70–90 |
| Marjoram | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Mint | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Oregano | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Parsley | Mar 2 | Mar 23 | Mar 30 | Jun 1 – Aug 3 | 60–80 |
| Rosemary | — | — | Apr 13 | Jul 6 – Nov 23 | 80–180 |
| Rue | — | — | Apr 13 | Jun 22 – Aug 24 | 70–90 |
| Sage | — | — | Apr 13 | Jun 29 – Aug 24 | 75–90 |
| Savory | — | — | Apr 13 | Jun 8 – Aug 3 | 50–70 |
| Sorrel | Mar 2 | Mar 23 | Mar 30 | May 11 – Jul 13 | 40–60 |
| Tarragon | — | — | Apr 13 | Jun 15 – Aug 24 | 60–90 |
| Thai Basil | Feb 16 | Apr 13 | Apr 20 | Jun 15 – Aug 17 | 50–75 |
| Thyme | — | — | Apr 13 | Jun 22 – Aug 24 | 70–90 |
| Valerian | — | — | Apr 13 | Aug 17 – Nov 23 | 120–180 |
| Yarrow | — | — | Apr 13 | Jul 13 – Sep 28 | 90–120 |
Monthly Planting Guide for Fairfax County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Fairfax County.
Frequently Asked Questions
What planting zone is Fairfax County, VA?
Fairfax County is in USDA Hardiness Zone 7a. 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 Fairfax County, VA?
Based on 31 years of NOAA weather station data, the median last spring frost in Fairfax County falls around April 6. In 8 out of 10 years, last frost lands between March 19 and April 25 — a 36-day window of variability. Use April 25 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Fairfax County, VA?
The median first fall frost in Fairfax County arrives around November 3. In cold years it can arrive as early as October 14; in mild years as late as November 23. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Fairfax County?
Fairfax County has a frost-free growing season of approximately 211 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 3.68 days per decade.
What is the soil like in Fairfax County for gardening?
Fairfax County has predominantly Silt Loam soil with a pH range of 5.4–6.5 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Fairfax County?
Fairfax County has commercial agriculture that includes Soybeans, Poultry, Hay, Corn, Wheat. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Fairfax County a good location for home gardening?
Fairfax County scores 54/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Fairfax County gardeners in Zone 7a 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.
