Columbia County, WI — Planting Guide
Your May game plan for Columbia County, Wisconsin
May rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Columbia County, Wisconsin.
-
Set out basil, cucumber, and kale seedlings
Your last frost (May 3) has passed. These warm-season crops can handle outdoor soil now.
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Outdoor sowing time: basil, cucumber, and green beans
Thin ruthlessly once seedlings are up. Crowded roots mean smaller crops from every plant.
-
Collect radish, cress, and microgreens at their peak
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
June will be here before you know it — start on
- Starting indoors: basil, cucumber, and kale
- First harvests: carrots, kale, and lettuce
Columbia County is in USDA Zone 5a. The average last spring frost is May 3 and the first fall frost is October 7, giving you a growing season of approximately 157 days.
At an elevation of 692 ft, Columbia County receives approximately 35.5 in of rainfall annually. Summer highs average 81°F with winter lows around 3°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 29 days year to year — ranging from April 22 in warm years to May 21 in cold years. The growing season is trending longer by about 1.68 days per decade. Columbia County scores 66/100 (Good) on the Microclimate Index.
🌡️ Zone
5a (°F to °F min)
❄️ Last Frost
May 3
🍂 First Frost
October 7
📅 Growing Season
157 days
⛰️ Elevation
692 ft
🌧️ Annual Rainfall
35.5 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 | 1.3 in | 9 days | — | None |
| Feb | 1.6 in | 6 days | — | None |
| Mar | 2.5 in | 10 days | — | None |
| Apr | 3.1 in | 10 days | 1.2 in | Moderate |
| May | 4.6 in | 9 days | — | Low |
| Jun | 5 in | 8 days | — | Low |
| Jul | 3.8 in | 9 days | 0.5 in | Low |
| Aug | 3.8 in | 7 days | 0.5 in | Low |
| Sep | 2.7 in | 6 days | 1.6 in | High |
| Oct | 2.7 in | 7 days | 1.6 in | High |
| Nov | 2.5 in | 8 days | — | None |
| Dec | 1.9 in | 8 days | — | None |
Annual total: 35.5 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.
Columbia County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-7.3
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 21 | Oct 17 | 149 days |
| Cautious | May 13 | Oct 13 | 153 days |
| Average year | May 3 | Oct 7 | 157 days |
| Optimistic | Apr 28 | Oct 2 | 157 days |
| Aggressive (risky) | Apr 22 | Sep 19 | 150 days |
Not very — frost dates can vary by ±29 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 1.7 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Columbia County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Columbia 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 Columbia County's climate and soil.
County Extension Office
Columbia 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 Columbia County
Finding local nurseries & garden centers in Columbia County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Columbia 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 Columbia County WI" or "garden center Columbia 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 Columbia County WI" or check your extension office and local parks department. Facebook groups like "Columbia 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
15.2 hours
Summer solstice daylight
Shortest Day
8.8 hours
Winter solstice daylight
Peak Sun Hours
9.8 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 | 9.1 hr | 3.5 hr | Short day |
| February | 10.3 hr | 4.7 hr | Short day |
| March | 11.6 hr | 5.6 hr | Short day |
| April | 13.2 hr | 6.7 hr | Neutral |
| May | 14.5 hr | 8.4 hr | Long day |
| June | 15.2 hr | 9.8 hr | Long day |
| July | 14.9 hr | 9.4 hr | Long day |
| August | 13.8 hr | 8.8 hr | Neutral |
| September | 12.3 hr | 7.4 hr | Neutral |
| October | 10.8 hr | 5.3 hr | Short day |
| November | 9.4 hr | 3.9 hr | Short day |
| December | 8.8 hr | 3.2 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 | 13°F | 25°F | ❄️ Dormant | ~36 weeks |
| Feb | 17°F | 22°F | ❄️ Dormant | ~36 weeks |
| Mar | 26°F | 30°F | ❄️ Dormant | ~36 weeks |
| Apr | 40°F | 41°F | ❄️ Dormant | ~36 weeks |
| May | 56°F | 49°F | ♻️ Active | ~14 weeks |
| Jun | 67°F | 59°F | 🔥 Peak | ~8 weeks |
| Jul | 72°F | 68°F | 🔥 Peak | ~8 weeks |
| Aug | 74°F | 67°F | 🔥 Peak | ~8 weeks |
| Sep | 64°F | 63°F | ♻️ Active | ~14 weeks |
| Oct | 52°F | 55°F | ♻️ Active | ~14 weeks |
| Nov | 38°F | 44°F | ❄️ Dormant | ~36 weeks |
| Dec | 22°F | 32°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 Columbia 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 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Cabbage worms | Low | Jun, Jul, Aug |
| Colorado potato beetle | Moderate | Jun, Jul |
| Flea beetles | Moderate | May, Jun, Jul |
| Slugs | Low | May, Jun, Jul, Aug, Sep |
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 Columbia County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 16 | Jul 29 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 8 | Aug 12 | ✓ 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 15 | Sep 9 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (5 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Daikon radish | Aug 15 | Apr 19 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 23 | Apr 19 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 5 | Apr 12 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 28 | Apr 12 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 29 | Apr 19 | — | 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: 10 mph
Fall: 10 mph Winter: 11 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (276 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
17,693 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 1,750 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, 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 35.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 17,693 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 Columbia County
Soil Type
Silt Loam
Soil pH 5.8–7.3 · Excessively 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. (35.5 in. annual rainfall)
Season Tips
157-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.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 24-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
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 Columbia County
106 vegetables that grow well in Zone 5a with planting dates for Columbia County.
Show all 106 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Mar 29 | May 10 | May 17 | Aug 9 – Sep 13 | 80–100 |
| Amaranth | Mar 8 | May 10 | May 17 | Aug 16 – Oct 4 | 90–120 |
| Arugula | Mar 29 | Apr 19 | May 3 | Jun 7 – Aug 9 | 30–50 |
| Asparagus | — | — | May 17 | — | 730–1095 |
| Beets | — | Apr 19 | — | Jun 14 – Jul 12 | 50–70 |
| Belgian Endive | Mar 29 | Apr 19 | May 3 | Aug 23 – Oct 18 | 110–150 |
| Bitter Melon | Mar 8 | May 10 | May 17 | Jul 19 – Aug 30 | 60–90 |
| Black Beans | — | May 10 | — | Aug 9 – Sep 27 | 90–120 |
| Bok Choy | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 19 | 40–60 |
| Broccoli | Mar 29 | Apr 19 | May 3 | Jul 5 – Aug 16 | 60–90 |
| Broccoli Rabe | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 19 | 40–60 |
| Brussels Sprouts | Mar 29 | Apr 19 | May 3 | Aug 2 – Sep 27 | 90–130 |
| Butternut Squash | Mar 29 | May 10 | May 17 | Aug 16 – Sep 20 | 85–110 |
| Cabbage | Mar 29 | Apr 19 | May 3 | Jul 5 – Aug 30 | 60–100 |
| Calabash | Mar 8 | May 10 | May 17 | Aug 9 – Oct 4 | 80–120 |
| Carrots | — | Apr 19 | — | Jun 21 – Jul 26 | 60–80 |
| Cauliflower | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 30 | 55–100 |
| Celeriac | Mar 29 | Apr 19 | May 3 | Aug 16 – Sep 20 | 100–120 |
| Celery | Mar 29 | Apr 19 | May 3 | Jul 26 – Sep 20 | 80–120 |
| Celtuce | Mar 29 | Apr 19 | May 3 | Jul 5 – Aug 16 | 60–90 |
| Chard | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 16 | 50–60 |
| Chickpeas | Mar 29 | Apr 19 | May 3 | Jul 26 – Sep 6 | 80–110 |
| Chicory | Mar 29 | Apr 19 | May 3 | Jul 5 – Aug 16 | 60–85 |
| Chinese Cabbage | Mar 29 | Apr 19 | May 3 | Jun 28 – Jul 26 | 50–70 |
| Christmas Lima Beans | Mar 8 | May 10 | May 17 | Aug 9 – Sep 13 | 80–100 |
| Collard Greens | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 30 | 55–75 |
| Corn | — | May 10 | — | Jul 12 – Sep 6 | 60–100 |
| Cowpeas | — | May 10 | — | Jul 12 – Aug 23 | 60–90 |
| Cress | Mar 29 | Apr 19 | May 3 | May 17 – Jun 7 | 14–21 |
| Crookneck Squash | Mar 29 | May 10 | May 17 | Jul 5 – Aug 2 | 45–60 |
| Crosne | — | Apr 19 | — | Sep 20 – Oct 4 | 150–200 |
| Cucumber | Mar 29 | May 10 | May 17 | Jul 12 – Sep 6 | 50–70 |
| Daikon | — | Apr 19 | — | Jun 14 – Jul 12 | 50–70 |
| Delicata Squash | Mar 29 | May 10 | May 17 | Aug 9 – Sep 13 | 80–100 |
| Edamame | — | May 10 | — | Jul 26 – Sep 6 | 75–100 |
| Eggplant | Feb 22 | May 10 | May 17 | Jul 26 – Sep 27 | 65–85 |
| Endive | Mar 29 | Apr 19 | May 3 | Jun 21 – Jul 26 | 45–65 |
| Escarole | Mar 29 | Apr 19 | May 3 | Jun 28 – Jul 26 | 50–70 |
| Fava Beans | Mar 29 | Apr 19 | May 3 | Jul 19 – Aug 30 | 75–100 |
| Fennel | Mar 8 | May 10 | May 17 | Jul 19 – Aug 30 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | May 10 | — | Jul 5 – Aug 30 | 50–65 |
| Horseradish | — | — | May 17 | Sep 20 – Nov 1 | 120–180 |
| Hot Peppers | Feb 22 | May 10 | May 17 | Jul 26 – Nov 1 | 70–120 |
| Hubbard Squash | Mar 29 | May 10 | May 17 | Aug 30 – Oct 4 | 100–120 |
| Kabocha | Mar 29 | May 10 | May 17 | Aug 16 – Sep 13 | 85–100 |
| Kai Lan | Mar 29 | Apr 19 | May 3 | Jun 21 – Jul 19 | 45–60 |
| Kale | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 23 | 50–70 |
| Kidney Beans | — | May 10 | — | Aug 9 – Sep 13 | 85–110 |
| Kohlrabi | Mar 29 | Apr 19 | May 3 | Jun 21 – Jul 26 | 45–65 |
| Komatsuna | Mar 29 | Apr 19 | May 3 | Jun 7 – Jul 12 | 35–50 |
| Leeks | Mar 29 | Apr 19 | May 3 | Aug 2 – Oct 18 | 90–150 |
| Lentils | Mar 29 | Apr 19 | May 3 | Jul 26 – Sep 6 | 80–110 |
| Lettuce | Mar 29 | Apr 19 | May 3 | Jun 7 – Aug 16 | 30–60 |
| Lima Beans | — | May 10 | — | Jul 12 – Aug 23 | 60–90 |
| Mache | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 19 | 40–60 |
| Melon | Mar 29 | May 10 | May 17 | Jul 26 – Sep 13 | 70–100 |
| Microgreens | Mar 29 | Apr 19 | May 3 | May 10 – Jun 7 | 7–21 |
| Mitsuba | Mar 29 | Apr 19 | Apr 26 | Jun 21 – Aug 16 | 50–70 |
| Mizuna | Mar 29 | Apr 19 | May 3 | Jun 7 – Jul 5 | 30–45 |
| Mustard Greens | Mar 29 | Apr 19 | May 3 | Jun 7 – Aug 9 | 30–50 |
| Napa Cabbage | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 2 | 55–75 |
| New Zealand Spinach | Mar 8 | May 10 | May 17 | Jul 12 – Aug 9 | 55–70 |
| Okra | Mar 8 | May 10 | May 17 | Jul 12 – Sep 6 | 50–65 |
| Onion | Mar 29 | Apr 19 | May 3 | Aug 2 – Sep 20 | 90–120 |
| Pac Choi | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 12 | 40–55 |
| Parsnip | — | Apr 19 | — | Aug 2 – Sep 13 | 100–130 |
| Patty Pan Squash | Mar 29 | May 10 | May 17 | Jul 5 – Aug 2 | 45–60 |
| Peas | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 23 | 55–70 |
| Peppers | Feb 22 | May 10 | May 17 | Jul 19 – Sep 27 | 60–90 |
| Pole Beans | Mar 8 | May 10 | May 17 | Jul 12 – Sep 6 | 55–70 |
| Potatoes | Mar 8 | May 10 | May 17 | Jul 26 – Oct 4 | 70–120 |
| Pumpkin | Mar 29 | May 10 | May 17 | Aug 16 – Oct 4 | 85–120 |
| Purslane | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 19 | 40–60 |
| Radicchio | Mar 29 | Apr 19 | May 3 | Jul 5 – Aug 9 | 60–80 |
| Radish | — | Apr 19 | — | May 17 – Jun 7 | 22–35 |
| Rhubarb | — | — | May 24 | — | 365–730 |
| Romanesco | Mar 29 | Apr 19 | May 3 | Jul 19 – Aug 30 | 75–100 |
| Rutabaga | — | Apr 19 | — | Jul 12 – Aug 16 | 80–100 |
| Salsify | — | Apr 19 | — | Aug 2 – Sep 13 | 100–130 |
| Savoy Cabbage | Mar 29 | Apr 19 | May 3 | Jul 12 – Sep 6 | 70–110 |
| Scallions | Mar 29 | Apr 19 | May 3 | Jun 28 – Jul 26 | 50–70 |
| Scarlet Runner Beans | Mar 8 | May 10 | May 17 | Jul 19 – Aug 23 | 60–80 |
| Shallot | Mar 29 | Apr 19 | May 3 | Aug 2 – Sep 20 | 90–120 |
| Shiso | Mar 15 | May 10 | May 17 | Jul 12 – Sep 6 | 50–70 |
| Snap Peas | Mar 8 | May 10 | May 17 | Jul 12 – Sep 6 | 55–70 |
| Snow Peas | Mar 29 | Apr 19 | May 3 | Jun 28 – Aug 23 | 50–65 |
| Soybeans | — | May 10 | — | Aug 2 – Sep 27 | 80–120 |
| Spaghetti Squash | Mar 29 | May 10 | May 17 | Aug 16 – Sep 13 | 85–100 |
| Spinach | Mar 29 | Apr 19 | May 3 | Jun 7 – Aug 9 | 35–50 |
| Squash (Summer) | Mar 29 | May 10 | May 17 | Jul 5 – Sep 6 | 45–65 |
| Squash (Winter) | Mar 29 | May 10 | May 17 | Aug 9 – Oct 4 | 80–120 |
| Sunchoke | — | — | May 17 | Sep 6 – Nov 1 | 110–150 |
| Sunflower | Mar 8 | May 10 | May 17 | Jul 26 – Sep 13 | 70–100 |
| Sweet Corn | — | May 10 | — | Jul 12 – Aug 23 | 60–90 |
| Sweet Potatoes | Mar 8 | May 10 | May 17 | Aug 16 – Oct 4 | 90–120 |
| Tatsoi | Mar 29 | Apr 19 | May 3 | Jun 7 – Jul 12 | 35–50 |
| Tomatillo | Mar 8 | May 10 | May 17 | Jul 19 – Sep 27 | 60–85 |
| Tomatoes | Mar 8 | May 10 | May 17 | Jul 19 – Sep 27 | 60–85 |
| Turnip | — | Apr 19 | — | May 31 – Jul 5 | 40–60 |
| Watercress | Mar 29 | Apr 19 | May 3 | Jun 14 – Jul 19 | 40–60 |
| Watermelon | Mar 29 | May 10 | May 17 | Jul 26 – Sep 13 | 70–100 |
| Wax Beans | — | May 10 | — | Jul 5 – Aug 30 | 50–65 |
| Winter Melon | Mar 8 | May 10 | May 17 | Aug 16 – Oct 4 | 90–120 |
| Yard Long Beans | Mar 8 | May 10 | May 17 | Jul 12 – Aug 23 | 55–80 |
| Zucchini | Mar 29 | May 10 | May 17 | Jul 5 – Aug 30 | 45–60 |
🍓 Fruits to Grow in Columbia County
27 fruits that grow well in Zone 5a with planting dates for Columbia County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 24 | Aug 23 – Nov 8 | 90–180 |
| Aronia | — | — | May 24 | — | 730–1095 |
| Blackberries | — | — | May 24 | — | 365–730 |
| Blueberries | — | — | May 24 | — | 730–1095 |
| Boysenberries | — | — | May 24 | — | 365–730 |
| Cantaloupe | — | — | May 24 | Aug 2 – Sep 6 | 70–90 |
| Che Fruit | — | — | May 24 | — | 1095–1825 |
| Cranberries | — | — | May 24 | — | 730–1095 |
| Currants | — | — | May 24 | — | 730–1095 |
| Elderberries | — | — | May 24 | — | 730–1095 |
| Goji Berries | — | — | May 24 | — | 730–1095 |
| Gooseberries | — | — | May 24 | — | 730–1095 |
| Grapes | — | — | May 24 | — | 730–1095 |
| Ground Cherry | — | — | May 24 | Aug 2 – Sep 27 | 65–80 |
| Hardy Kiwi | — | — | May 24 | — | 1095–1825 |
| Haskaps | — | — | May 24 | — | 730–1095 |
| Honeydew | — | — | May 24 | Aug 16 – Sep 27 | 80–110 |
| Jostaberry | — | — | May 24 | — | 730–1095 |
| Lingonberries | — | — | May 24 | — | 730–1095 |
| Medlar | — | — | May 24 | — | 1095–1825 |
| Mulberries | — | — | May 24 | — | 730–1825 |
| Pawpaw | — | — | May 24 | — | 1095–2555 |
| Persimmon | — | — | May 24 | — | 1095–2555 |
| Quince | — | — | May 24 | — | 1095–1825 |
| Raspberries | — | — | May 24 | — | 365–730 |
| Serviceberries | — | — | May 24 | — | 730–1095 |
| Strawberries | — | — | May 24 | Aug 23 – Nov 8 | 90–365 |
🌿 Herbs to Grow in Columbia County
37 herbs that grow well in Zone 5a with planting dates for Columbia County.
Show all 37 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Mar 29 | Apr 19 | Apr 26 | — | 365–730 |
| Anise | Mar 29 | Apr 19 | Apr 26 | Jul 26 – Oct 11 | 90–120 |
| Basil | Mar 15 | May 10 | May 17 | Jul 12 – Sep 13 | 50–75 |
| Bee Balm | — | — | May 10 | Aug 9 – Oct 25 | 90–120 |
| Borage | Mar 29 | Apr 19 | Apr 26 | Jun 21 – Aug 9 | 50–60 |
| Caraway | Mar 29 | Apr 19 | Apr 26 | — | 365–450 |
| Catnip | — | — | May 10 | Jul 12 – Sep 13 | 60–80 |
| Chamomile | Mar 29 | Apr 19 | Apr 26 | Jun 28 – Sep 6 | 60–90 |
| Chervil | Mar 29 | Apr 19 | Apr 26 | Jun 7 – Aug 9 | 40–60 |
| Chives | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Cilantro | Mar 29 | Apr 19 | Apr 26 | Jun 7 – Aug 9 | 40–60 |
| Comfrey | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Cumin | Mar 29 | Apr 19 | Apr 26 | Aug 9 – Oct 11 | 100–120 |
| Dill | Mar 29 | Apr 19 | Apr 26 | Jun 7 – Aug 9 | 40–60 |
| Echinacea | — | — | May 10 | Sep 13 – Oct 25 | 120–180 |
| Epazote | Mar 15 | May 10 | May 17 | Jul 5 – Aug 30 | 45–60 |
| Fennel (herb) | Mar 29 | Apr 19 | Apr 26 | Jun 28 – Sep 6 | 60–90 |
| Feverfew | — | — | May 10 | Aug 9 – Oct 25 | 90–120 |
| Garlic Chives | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Horehound | — | — | May 10 | Jul 26 – Sep 20 | 75–90 |
| Hyssop | — | — | May 10 | Jul 19 – Sep 20 | 70–90 |
| Lavender | — | — | May 10 | Aug 9 – Oct 25 | 90–200 |
| Lemon Balm | — | — | May 10 | Jul 12 – Aug 30 | 60–70 |
| Lemon Thyme | — | — | May 10 | Jul 19 – Sep 20 | 70–90 |
| Lovage | — | — | May 10 | Jul 19 – Sep 20 | 70–90 |
| Mint | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Oregano | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Parsley | Mar 29 | Apr 19 | Apr 26 | Jun 28 – Aug 30 | 60–80 |
| Rue | — | — | May 10 | Jul 19 – Sep 20 | 70–90 |
| Sage | — | — | May 10 | Jul 26 – Sep 20 | 75–90 |
| Savory | — | — | May 10 | Jul 5 – Aug 30 | 50–70 |
| Sorrel | Mar 29 | Apr 19 | Apr 26 | Jun 7 – Aug 9 | 40–60 |
| Tarragon | — | — | May 10 | Jul 12 – Sep 20 | 60–90 |
| Thai Basil | Mar 15 | May 10 | May 17 | Jul 12 – Sep 13 | 50–75 |
| Thyme | — | — | May 10 | Jul 19 – Sep 20 | 70–90 |
| Valerian | — | — | May 10 | Sep 13 – Oct 25 | 120–180 |
| Yarrow | — | — | May 10 | Aug 9 – Oct 25 | 90–120 |
Monthly Planting Guide for Columbia County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Columbia County.
Frequently Asked Questions
What planting zone is Columbia County, WI?
Columbia 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 Columbia County, WI?
Based on 31 years of NOAA weather station data, the median last spring frost in Columbia County falls around May 3. In 8 out of 10 years, last frost lands between April 22 and May 21 — a 29-day window of variability. Use May 21 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Columbia County, WI?
The median first fall frost in Columbia County arrives around October 7. In cold years it can arrive as early as September 19; in mild years as late as October 17. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Columbia County?
Columbia County has a frost-free growing season of approximately 157 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 longer by about 1.68 days per decade.
What is the soil like in Columbia County for gardening?
Columbia County has predominantly Silt Loam soil with a pH range of 5.8–7.3 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Columbia County?
Columbia County has commercial agriculture that includes Corn, Soybeans, Hay. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Columbia County a good location for home gardening?
Columbia County scores 66/100 (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.
Your Columbia County Garden Planner — Free
A 24-page printable planner built for Columbia County (Zone 5a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log