Walworth County, WI — Planting Guide
Walworth County is in USDA Zone 5a. The average last spring frost is April 26 and the first fall frost is October 13, giving you a growing season of approximately 170 days.
At an elevation of 1,101 ft, Walworth County receives approximately 39.6 in of rainfall annually. Summer highs average 87°F with winter lows around 17°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 28 days year to year — ranging from April 14 in warm years to May 12 in cold years. The growing season is trending shorter by about 0.88 days per decade. Walworth County scores 68/100 (Good) on the Microclimate Index.
🌡️ Zone
5a (-20°F to -15°F min)
❄️ Last Frost
April 26
🍂 First Frost
October 13
📅 Growing Season
170 days
⛰️ Elevation
1,101 ft
🌧️ Annual Rainfall
39.6 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 | 1.9 in | 7 days | — | None |
| Feb | 1.8 in | 6 days | — | None |
| Mar | 2.5 in | 8 days | — | None |
| Apr | 3.8 in | 10 days | 0.5 in | Low |
| May | 4.2 in | 9 days | 0.1 in | Low |
| Jun | 4.7 in | 9 days | — | Low |
| Jul | 4.9 in | 9 days | — | Low |
| Aug | 4.1 in | 8 days | 0.2 in | Low |
| Sep | 4.2 in | 6 days | 0.1 in | Low |
| Oct | 2.9 in | 8 days | 1.4 in | Moderate |
| Nov | 2.7 in | 6 days | — | None |
| Dec | 2 in | 8 days | — | None |
Annual total: 39.7 in. Gardens typically need ~1 inch of water per week during the growing season. Months marked "None" for extra water are outside the active growing season for your zone — most gardens are dormant and don't need irrigation during those months.
Walworth County Soil Profile
Soil Type
Silt Loam
Soil pH
6.2-6.9
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) | May 12 | Oct 27 | 168 days |
| Cautious | May 2 | Oct 19 | 170 days |
| Average year | Apr 26 | Oct 13 | 170 days |
| Optimistic | Apr 22 | Oct 8 | 169 days |
| Aggressive (risky) | Apr 14 | Oct 3 | 172 days |
Not very — frost dates can vary by ±28 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Slightly — seasons are trending a bit shorter (0.9 days/decade). Stay conservative with planting dates.
Gardening Difficulty Score
Walworth County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Walworth 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 Walworth County's climate and soil.
County Extension Office
Walworth County University of Wisconsin-Madison Division of Extension Extension Office
Phone: 608-263-7779
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 Walworth County
Finding local nurseries & garden centers in Walworth County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Walworth 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 Walworth County WI" or "garden center Walworth 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 Walworth County WI" or check your extension office and local parks department. Facebook groups like "Walworth County Gardeners" or "Wisconsin 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
15.1 hours
Summer solstice daylight
Shortest Day
8.9 hours
Winter solstice daylight
Peak Sun Hours
9.5 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 | 9.2 hr | 3.8 hr | Short day |
| February | 10.3 hr | 4.4 hr | Short day |
| March | 11.7 hr | 5.6 hr | Short day |
| April | 13.2 hr | 6.8 hr | Neutral |
| May | 14.4 hr | 8 hr | Long day |
| June | 15.1 hr | 9.2 hr | Long day |
| July | 14.8 hr | 9.5 hr | Long day |
| August | 13.7 hr | 8.6 hr | Neutral |
| September | 12.3 hr | 6.8 hr | Neutral |
| October | 10.8 hr | 5.4 hr | Short day |
| November | 9.5 hr | 3.7 hr | Short day |
| December | 8.9 hr | 3.3 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 Jun through Sep.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 24°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 23°F | 29°F | ❄️ Dormant | ~36 weeks |
| Mar | 30°F | 34°F | ❄️ Dormant | ~36 weeks |
| Apr | 44°F | 44°F | 🐢 Slow | ~24 weeks |
| May | 56°F | 53°F | ♻️ Active | ~14 weeks |
| Jun | 68°F | 63°F | 🔥 Peak | ~8 weeks |
| Jul | 77°F | 71°F | 🔥 Peak | ~8 weeks |
| Aug | 77°F | 72°F | 🔥 Peak | ~8 weeks |
| Sep | 72°F | 67°F | 🔥 Peak | ~8 weeks |
| Oct | 55°F | 60°F | ♻️ Active | ~14 weeks |
| Nov | 42°F | 47°F | 🐢 Slow | ~24 weeks |
| Dec | 28°F | 39°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Walworth 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
Moderate — watch for mildew and blight during wet periods.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
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
Cover Crops for Walworth County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 20 | Apr 12 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 29 | Apr 5 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 4 | Apr 5 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 1 | Apr 12 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 17 | Apr 12 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 11 | Apr 12 | — | Erosion control, weed suppression, good biomass |
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 30 | Aug 11 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 27 | Aug 18 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 29 | Aug 18 | ✓ 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 | May 24 | Sep 22 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 13 mph Summer: 9 mph
Fall: 10 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (140 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
19,786 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
May, Jun, Jul, Sep
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, 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 39.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,786 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Walworth County
Soil Type
Silt Loam
Soil pH 6.2–6.9 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
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
170-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
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 Walworth County
106 vegetables that grow well in Zone 5a with planting dates for Walworth County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 22 | May 3 | May 10 | Aug 2 – Sep 6 | 80–100 |
| Amaranth | Mar 1 | May 3 | May 10 | Aug 9 – Sep 27 | 90–120 |
| Arugula | Mar 22 | Apr 12 | Apr 26 | May 31 – Aug 2 | 30–50 |
| Asparagus | — | — | May 10 | — | 730–1095 |
| Beets | — | Apr 12 | — | Jun 7 – Jul 5 | 50–70 |
| Belgian Endive | Mar 22 | Apr 12 | Apr 26 | Aug 16 – Oct 11 | 110–150 |
| Bitter Melon | Mar 1 | May 3 | May 10 | Jul 12 – Aug 23 | 60–90 |
| Black Beans | — | May 3 | — | Aug 2 – Sep 20 | 90–120 |
| Bok Choy | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 12 | 40–60 |
| Broccoli | Mar 22 | Apr 12 | Apr 26 | Jun 28 – Aug 9 | 60–90 |
| Broccoli Rabe | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 12 | 40–60 |
| Brussels Sprouts | Mar 22 | Apr 12 | Apr 26 | Jul 26 – Sep 20 | 90–130 |
| Butternut Squash | Mar 22 | May 3 | May 10 | Aug 9 – Sep 13 | 85–110 |
| Cabbage | Mar 22 | Apr 12 | Apr 26 | Jun 28 – Aug 23 | 60–100 |
| Calabash | Mar 1 | May 3 | May 10 | Aug 2 – Sep 27 | 80–120 |
| Carrots | — | Apr 12 | — | Jun 14 – Jul 19 | 60–80 |
| Cauliflower | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 23 | 55–100 |
| Celeriac | Mar 22 | Apr 12 | Apr 26 | Aug 9 – Sep 13 | 100–120 |
| Celery | Mar 22 | Apr 12 | Apr 26 | Jul 19 – Sep 13 | 80–120 |
| Celtuce | Mar 22 | Apr 12 | Apr 26 | Jun 28 – Aug 9 | 60–90 |
| Chard | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 9 | 50–60 |
| Chickpeas | Mar 22 | Apr 12 | Apr 26 | Jul 19 – Aug 30 | 80–110 |
| Chicory | Mar 22 | Apr 12 | Apr 26 | Jun 28 – Aug 9 | 60–85 |
| Chinese Cabbage | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Jul 19 | 50–70 |
| Christmas Lima Beans | Mar 1 | May 3 | May 10 | Aug 2 – Sep 6 | 80–100 |
| Collard Greens | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 23 | 55–75 |
| Corn | — | May 3 | — | Jul 5 – Aug 30 | 60–100 |
| Cowpeas | — | May 3 | — | Jul 5 – Aug 16 | 60–90 |
| Cress | Mar 22 | Apr 12 | Apr 26 | May 10 – May 31 | 14–21 |
| Crookneck Squash | Mar 22 | May 3 | May 10 | Jun 28 – Jul 26 | 45–60 |
| Crosne | — | Apr 12 | — | Sep 13 – Sep 27 | 150–200 |
| Cucumber | Mar 22 | May 3 | May 10 | Jul 5 – Aug 30 | 50–70 |
| Daikon | — | Apr 12 | — | Jun 7 – Jul 5 | 50–70 |
| Delicata Squash | Mar 22 | May 3 | May 10 | Aug 2 – Sep 6 | 80–100 |
| Edamame | — | May 3 | — | Jul 19 – Aug 30 | 75–100 |
| Eggplant | Feb 15 | May 3 | May 10 | Jul 19 – Sep 20 | 65–85 |
| Endive | Mar 22 | Apr 12 | Apr 26 | Jun 14 – Jul 19 | 45–65 |
| Escarole | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Jul 19 | 50–70 |
| Fava Beans | Mar 22 | Apr 12 | Apr 26 | Jul 12 – Aug 23 | 75–100 |
| Fennel | Mar 1 | May 3 | May 10 | Jul 12 – Aug 23 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 3 | — | Jun 28 – Aug 23 | 50–65 |
| Horseradish | — | — | May 10 | Sep 13 – Oct 25 | 120–180 |
| Hot Peppers | Feb 15 | May 3 | May 10 | Jul 19 – Oct 25 | 70–120 |
| Hubbard Squash | Mar 22 | May 3 | May 10 | Aug 23 – Sep 27 | 100–120 |
| Kabocha | Mar 22 | May 3 | May 10 | Aug 9 – Sep 6 | 85–100 |
| Kai Lan | Mar 22 | Apr 12 | Apr 26 | Jun 14 – Jul 12 | 45–60 |
| Kale | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 16 | 50–70 |
| Kidney Beans | — | May 3 | — | Aug 2 – Sep 6 | 85–110 |
| Kohlrabi | Mar 22 | Apr 12 | Apr 26 | Jun 14 – Jul 19 | 45–65 |
| Komatsuna | Mar 22 | Apr 12 | Apr 26 | May 31 – Jul 5 | 35–50 |
| Leeks | Mar 22 | Apr 12 | Apr 26 | Jul 26 – Oct 11 | 90–150 |
| Lentils | Mar 22 | Apr 12 | Apr 26 | Jul 19 – Aug 30 | 80–110 |
| Lettuce | Mar 22 | Apr 12 | Apr 26 | May 31 – Aug 9 | 30–60 |
| Lima Beans | — | May 3 | — | Jul 5 – Aug 16 | 60–90 |
| Mache | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 12 | 40–60 |
| Melon | Mar 22 | May 3 | May 10 | Jul 19 – Sep 6 | 70–100 |
| Microgreens | Mar 22 | Apr 12 | Apr 26 | May 3 – May 31 | 7–21 |
| Mitsuba | Mar 22 | Apr 12 | Apr 19 | Jun 14 – Aug 9 | 50–70 |
| Mizuna | Mar 22 | Apr 12 | Apr 26 | May 31 – Jun 28 | 30–45 |
| Mustard Greens | Mar 22 | Apr 12 | Apr 26 | May 31 – Aug 2 | 30–50 |
| Napa Cabbage | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Jul 26 | 55–75 |
| New Zealand Spinach | Mar 1 | May 3 | May 10 | Jul 5 – Aug 2 | 55–70 |
| Okra | Mar 1 | May 3 | May 10 | Jul 5 – Aug 30 | 50–65 |
| Onion | Mar 22 | Apr 12 | Apr 26 | Jul 26 – Sep 13 | 90–120 |
| Pac Choi | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 5 | 40–55 |
| Parsnip | — | Apr 12 | — | Jul 26 – Sep 6 | 100–130 |
| Patty Pan Squash | Mar 22 | May 3 | May 10 | Jun 28 – Jul 26 | 45–60 |
| Peas | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 16 | 55–70 |
| Peppers | Feb 15 | May 3 | May 10 | Jul 12 – Sep 20 | 60–90 |
| Pole Beans | Mar 1 | May 3 | May 10 | Jul 5 – Aug 30 | 55–70 |
| Potatoes | Mar 1 | May 3 | May 10 | Jul 19 – Sep 27 | 70–120 |
| Pumpkin | Mar 22 | May 3 | May 10 | Aug 9 – Sep 27 | 85–120 |
| Purslane | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 12 | 40–60 |
| Radicchio | Mar 22 | Apr 12 | Apr 26 | Jun 28 – Aug 2 | 60–80 |
| Radish | — | Apr 12 | — | May 10 – May 31 | 22–35 |
| Rhubarb | — | — | May 17 | — | 365–730 |
| Romanesco | Mar 22 | Apr 12 | Apr 26 | Jul 12 – Aug 23 | 75–100 |
| Rutabaga | — | Apr 12 | — | Jul 5 – Aug 9 | 80–100 |
| Salsify | — | Apr 12 | — | Jul 26 – Sep 6 | 100–130 |
| Savoy Cabbage | Mar 22 | Apr 12 | Apr 26 | Jul 5 – Aug 30 | 70–110 |
| Scallions | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Jul 19 | 50–70 |
| Scarlet Runner Beans | Mar 1 | May 3 | May 10 | Jul 12 – Aug 16 | 60–80 |
| Shallot | Mar 22 | Apr 12 | Apr 26 | Jul 26 – Sep 13 | 90–120 |
| Shiso | Mar 8 | May 3 | May 10 | Jul 5 – Aug 30 | 50–70 |
| Snap Peas | Mar 1 | May 3 | May 10 | Jul 5 – Aug 30 | 55–70 |
| Snow Peas | Mar 22 | Apr 12 | Apr 26 | Jun 21 – Aug 16 | 50–65 |
| Soybeans | — | May 3 | — | Jul 26 – Sep 20 | 80–120 |
| Spaghetti Squash | Mar 22 | May 3 | May 10 | Aug 9 – Sep 6 | 85–100 |
| Spinach | Mar 22 | Apr 12 | Apr 26 | May 31 – Aug 2 | 35–50 |
| Squash (Summer) | Mar 22 | May 3 | May 10 | Jun 28 – Aug 30 | 45–65 |
| Squash (Winter) | Mar 22 | May 3 | May 10 | Aug 2 – Sep 27 | 80–120 |
| Sunchoke | — | — | May 10 | Aug 30 – Oct 25 | 110–150 |
| Sunflower | Mar 1 | May 3 | May 10 | Jul 19 – Sep 6 | 70–100 |
| Sweet Corn | — | May 3 | — | Jul 5 – Aug 16 | 60–90 |
| Sweet Potatoes | Mar 1 | May 3 | May 10 | Aug 9 – Sep 27 | 90–120 |
| Tatsoi | Mar 22 | Apr 12 | Apr 26 | May 31 – Jul 5 | 35–50 |
| Tomatillo | Mar 1 | May 3 | May 10 | Jul 12 – Sep 20 | 60–85 |
| Tomatoes | Mar 1 | May 3 | May 10 | Jul 12 – Sep 20 | 60–85 |
| Turnip | — | Apr 12 | — | May 24 – Jun 28 | 40–60 |
| Watercress | Mar 22 | Apr 12 | Apr 26 | Jun 7 – Jul 12 | 40–60 |
| Watermelon | Mar 22 | May 3 | May 10 | Jul 19 – Sep 6 | 70–100 |
| Wax Beans | — | May 3 | — | Jun 28 – Aug 23 | 50–65 |
| Winter Melon | Mar 1 | May 3 | May 10 | Aug 9 – Sep 27 | 90–120 |
| Yard Long Beans | Mar 1 | May 3 | May 10 | Jul 5 – Aug 16 | 55–80 |
| Zucchini | Mar 22 | May 3 | May 10 | Jun 28 – Aug 23 | 45–60 |
🍓 Fruits to Grow in Walworth County
27 fruits that grow well in Zone 5a with planting dates for Walworth County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 17 | Aug 16 – Nov 1 | 90–180 |
| Aronia | — | — | May 17 | — | 730–1095 |
| Blackberries | — | — | May 17 | — | 365–730 |
| Blueberries | — | — | May 17 | — | 730–1095 |
| Boysenberries | — | — | May 17 | — | 365–730 |
| Cantaloupe | — | — | May 17 | Jul 26 – Aug 30 | 70–90 |
| Che Fruit | — | — | May 17 | — | 1095–1825 |
| Cranberries | — | — | May 17 | — | 730–1095 |
| Currants | — | — | May 17 | — | 730–1095 |
| Elderberries | — | — | May 17 | — | 730–1095 |
| Goji Berries | — | — | May 17 | — | 730–1095 |
| Gooseberries | — | — | May 17 | — | 730–1095 |
| Grapes | — | — | May 17 | — | 730–1095 |
| Ground Cherry | — | — | May 17 | Jul 26 – Sep 20 | 65–80 |
| Hardy Kiwi | — | — | May 17 | — | 1095–1825 |
| Haskaps | — | — | May 17 | — | 730–1095 |
| Honeydew | — | — | May 17 | Aug 9 – Sep 20 | 80–110 |
| Jostaberry | — | — | May 17 | — | 730–1095 |
| Lingonberries | — | — | May 17 | — | 730–1095 |
| Medlar | — | — | May 17 | — | 1095–1825 |
| Mulberries | — | — | May 17 | — | 730–1825 |
| Pawpaw | — | — | May 17 | — | 1095–2555 |
| Persimmon | — | — | May 17 | — | 1095–2555 |
| Quince | — | — | May 17 | — | 1095–1825 |
| Raspberries | — | — | May 17 | — | 365–730 |
| Serviceberries | — | — | May 17 | — | 730–1095 |
| Strawberries | — | — | May 17 | Aug 16 – Nov 1 | 90–365 |
🌿 Herbs to Grow in Walworth County
37 herbs that grow well in Zone 5a with planting dates for Walworth County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 22 | Apr 12 | Apr 19 | — | 365–730 |
| Anise | Mar 22 | Apr 12 | Apr 19 | Jul 19 – Oct 4 | 90–120 |
| Basil | Mar 8 | May 3 | May 10 | Jul 5 – Sep 6 | 50–75 |
| Bee Balm | — | — | May 3 | Aug 2 – Oct 18 | 90–120 |
| Borage | Mar 22 | Apr 12 | Apr 19 | Jun 14 – Aug 2 | 50–60 |
| Caraway | Mar 22 | Apr 12 | Apr 19 | — | 365–450 |
| Catnip | — | — | May 3 | Jul 5 – Sep 6 | 60–80 |
| Chamomile | Mar 22 | Apr 12 | Apr 19 | Jun 21 – Aug 30 | 60–90 |
| Chervil | Mar 22 | Apr 12 | Apr 19 | May 31 – Aug 2 | 40–60 |
| Chives | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Cilantro | Mar 22 | Apr 12 | Apr 19 | May 31 – Aug 2 | 40–60 |
| Comfrey | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Cumin | Mar 22 | Apr 12 | Apr 19 | Aug 2 – Oct 4 | 100–120 |
| Dill | Mar 22 | Apr 12 | Apr 19 | May 31 – Aug 2 | 40–60 |
| Echinacea | — | — | May 3 | Sep 6 – Oct 18 | 120–180 |
| Epazote | Mar 8 | May 3 | May 10 | Jun 28 – Aug 23 | 45–60 |
| Fennel (herb) | Mar 22 | Apr 12 | Apr 19 | Jun 21 – Aug 30 | 60–90 |
| Feverfew | — | — | May 3 | Aug 2 – Oct 18 | 90–120 |
| Garlic Chives | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Horehound | — | — | May 3 | Jul 19 – Sep 13 | 75–90 |
| Hyssop | — | — | May 3 | Jul 12 – Sep 13 | 70–90 |
| Lavender | — | — | May 3 | Aug 2 – Oct 18 | 90–200 |
| Lemon Balm | — | — | May 3 | Jul 5 – Aug 23 | 60–70 |
| Lemon Thyme | — | — | May 3 | Jul 12 – Sep 13 | 70–90 |
| Lovage | — | — | May 3 | Jul 12 – Sep 13 | 70–90 |
| Mint | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Oregano | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Parsley | Mar 22 | Apr 12 | Apr 19 | Jun 21 – Aug 23 | 60–80 |
| Rue | — | — | May 3 | Jul 12 – Sep 13 | 70–90 |
| Sage | — | — | May 3 | Jul 19 – Sep 13 | 75–90 |
| Savory | — | — | May 3 | Jun 28 – Aug 23 | 50–70 |
| Sorrel | Mar 22 | Apr 12 | Apr 19 | May 31 – Aug 2 | 40–60 |
| Tarragon | — | — | May 3 | Jul 5 – Sep 13 | 60–90 |
| Thai Basil | Mar 8 | May 3 | May 10 | Jul 5 – Sep 6 | 50–75 |
| Thyme | — | — | May 3 | Jul 12 – Sep 13 | 70–90 |
| Valerian | — | — | May 3 | Sep 6 – Oct 18 | 120–180 |
| Yarrow | — | — | May 3 | Aug 2 – Oct 18 | 90–120 |
Monthly Planting Guide for Walworth County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Walworth County.
Frequently Asked Questions
What planting zone is Walworth County, WI?
Walworth County is in USDA Hardiness Zone 5a. 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 Walworth County, WI?
Based on 31 years of NOAA weather station data, the median last spring frost in Walworth County falls around April 26. In 8 out of 10 years, last frost lands between April 14 and May 12 — a 28-day window of variability. Use May 12 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Walworth County, WI?
The median first fall frost in Walworth County arrives around October 13. In cold years it can arrive as early as October 3; in mild years as late as October 27. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Walworth County?
Walworth County has a frost-free growing season of approximately 170 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing. Climate records show the growing season is trending shorter by about 0.88 days per decade.
What is the soil like in Walworth County for gardening?
Walworth County has predominantly Silt Loam soil with a pH range of 6.2–6.9 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Walworth County?
Walworth County has commercial agriculture that includes Corn, Soybeans, Hay, Dairy, Oats. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Walworth County a good location for home gardening?
Walworth County scores 68/100 (Good) 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 Walworth County gardeners in Zone 5a 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.
