Rock County, WI — Planting Guide
Your June gardening checklist
Your Rock County, Wisconsin garden is entering a new phase. Here's what's on the schedule for June and why each task matters now.
-
Get basil, pole beans, and thai basil seeds going inside
Bottom-water once the first true leaves appear — it keeps stems dry and knocks back damping-off.
-
It's harvest week for carrots, green beans, and kale
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Get ahead of July
- Starting indoors: peppers, begonias, and eggplant
- First harvests: basil, carrots, and cucumber
Rock County is in USDA Zone 5b. 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 710 ft, Rock County receives approximately 30.4 in of rainfall annually. Summer highs average 86°F with winter lows around 14°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 27 days year to year — ranging from April 14 in warm years to May 11 in cold years. The growing season is trending shorter by about 2.25 days per decade. Rock County scores 59/100 (Moderate) on the Microclimate Index.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
April 26
🍂 First Frost
October 13
📅 Growing Season
170 days
⛰️ Elevation
710 ft
🌧️ Annual Rainfall
30.4 in
Monthly Watering Calendar for Rock County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
Why it matters: Watering by the calendar wastes water. Watering by the soil moisture (or by a free rain gauge) cuts your water use 30%+ and produces healthier roots. Rock County's 30" annual baseline is the starting point.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.3 in | 8 days | — | None |
| Feb | 1.4 in | 7 days | — | None |
| Mar | 2.1 in | 9 days | — | None |
| Apr | 3.3 in | 11 days | 1 in | Moderate |
| May | 3.1 in | 10 days | 1.2 in | Moderate |
| Jun | 3.8 in | 10 days | 0.5 in | Low |
| Jul | 3.2 in | 8 days | 1.1 in | Moderate |
| Aug | 3 in | 9 days | 1.3 in | Moderate |
| Sep | 2.8 in | 7 days | 1.5 in | Moderate |
| Oct | 2.6 in | 9 days | 1.7 in | High |
| Nov | 2.4 in | 7 days | — | None |
| Dec | 1.5 in | 7 days | — | None |
Annual total: 30.5 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.
Rock County Soil Profile
Soil Type
Silt Loam
Soil pH
6.2-7.1
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 11 | Oct 27 | 169 days |
| Cautious | Apr 29 | Oct 19 | 173 days |
| Average year | Apr 26 | Oct 13 | 170 days |
| Optimistic | Apr 21 | Oct 8 | 170 days |
| Aggressive (risky) | Apr 14 | Oct 3 | 172 days |
Not very — frost dates can vary by ±27 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 shorter here (about 2.3 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Rock County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Rock 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 Rock County's climate and soil.
County Extension Office
Rock 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 Rock County
Finding local nurseries & garden centers in Rock County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Rock 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 Rock County WI" or "garden center Rock 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 Rock County WI" or check your extension office and local parks department. Facebook groups like "Rock 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 in Rock County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
What this means for you: Lettuce and cilantro "bolt" (go to seed) when days lengthen. Knowing your day-length curve helps you time spring plantings to harvest before the bolting trigger hits. Rock County's daylight ranges shape the planting calendar.
Longest Day
15.1 hours
Summer solstice daylight
Shortest Day
8.9 hours
Winter solstice daylight
Peak Sun Hours
10.1 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your 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 | 4.6 hr | Short day |
| March | 11.7 hr | 5.7 hr | Short day |
| April | 13.2 hr | 7.2 hr | Neutral |
| May | 14.4 hr | 8.5 hr | Long day |
| June | 15.1 hr | 9.6 hr | Long day |
| July | 14.8 hr | 10.1 hr | Long day |
| August | 13.7 hr | 8.8 hr | Neutral |
| September | 12.3 hr | 6.9 hr | Neutral |
| October | 10.8 hr | 5.6 hr | Short day |
| November | 9.5 hr | 3.9 hr | Short day |
| December | 8.9 hr | 3.5 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Rock County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why it matters: Soil heats slower than air in spring and cools slower in fall. That's why "warm" April air doesn't mean "plant tomatoes" — soil still trails by weeks. Rock County's monthly soil curve makes the lag visible.
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 | 32°F | ❄️ Dormant | ~36 weeks |
| Feb | 24°F | 31°F | ❄️ Dormant | ~36 weeks |
| Mar | 32°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 47°F | 45°F | 🐢 Slow | ~24 weeks |
| May | 57°F | 55°F | ♻️ Active | ~14 weeks |
| Jun | 70°F | 65°F | 🔥 Peak | ~8 weeks |
| Jul | 76°F | 70°F | 🔥 Peak | ~8 weeks |
| Aug | 78°F | 74°F | 🔥 Peak | ~8 weeks |
| Sep | 72°F | 69°F | 🔥 Peak | ~8 weeks |
| Oct | 59°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 45°F | 48°F | 🐢 Slow | ~24 weeks |
| Dec | 29°F | 38°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 Rock County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Quick context: Pest pressure is a function of climate, not effort. Rock County's baseline tells you how much vigilance is normal. A bad pest year in low-pressure region = a normal year in high-pressure region.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
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 | Moderate | Jun, Jul, Aug |
| Tomato hornworms | Moderate | Jul, Aug |
| Cabbage loopers | Moderate | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for Rock County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
What this means for you: Cover crops fix nitrogen by hosting bacteria that pull it from the air. A vigorous legume cover crop can deliver 50-150 lbs/acre of nitrogen — meaningful for the next vegetable season.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 5 | Aug 11 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 6 | Aug 11 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 1 | 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 10 | Sep 29 | — | Deep roots break compaction, attract pollinators and beneficial insects |
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 16 | Apr 5 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 15 | Apr 5 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 22 | Apr 5 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 11 | Apr 5 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 16 | Apr 5 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 16 | Apr 12 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Rock County
The practical takeaway: Wind dries soil, knocks over young transplants, and disrupts pollination for bees and butterflies. Rock County averages 9.3 mph — above 10 mph means windbreaks (shrubs, fences, taller crops to windward), staked tomatoes from day one, and an extra round of watering during dry windy spells. Lower wind = lower water bills and fewer broken stems.
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: 13 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
7.1/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
Low
Relatively flat terrain (240 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Rock County
How much water you can collect, when to collect it, and what size system you need for your garden.
What this means for you: Rainwater scales linearly with roof area. A 2,000 sq ft roof in Rock County captures ~1,200 gallons per 1" of rain — given 30" annual rainfall, that's thousands of gallons a year if you have storage to hold it.
Annual Collection
15,201 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
Apr, May, Jun, Jul
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 30.5 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,201 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 Rock County
Soil Type
Silt Loam
Soil pH 6.2–7.1 · Moderately 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.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-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 Rock County
105 vegetables that grow well in Zone 5b with planting dates for Rock County.
Show all 105 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | 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 | Aug 4 | May 31 – Aug 2 | 30–50 |
| Asparagus | — | — | May 10 | — | — | 730–1095 |
| Beets | — | Apr 12 | — | Aug 4 | Jun 7 – Jul 5 | 50–70 |
| Belgian Endive | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | Jun 7 – Jul 12 | 40–60 |
| Broccoli | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 28 – Aug 9 | 60–90 |
| Broccoli Rabe | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 7 – Jul 12 | 40–60 |
| Brussels Sprouts | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | Jun 28 – Aug 23 | 60–100 |
| Calabash | Mar 1 | May 3 | May 10 | — | Aug 2 – Sep 27 | 80–120 |
| Carrots | — | Apr 12 | — | Aug 4 | Jun 14 – Jul 19 | 60–80 |
| Cauliflower | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 21 – Aug 23 | 55–100 |
| Celeriac | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Aug 9 – Sep 13 | 100–120 |
| Celery | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 19 – Sep 13 | 80–120 |
| Celtuce | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 28 – Aug 9 | 60–90 |
| Chard | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 21 – Aug 9 | 50–60 |
| Chickpeas | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 19 – Aug 30 | 80–110 |
| Chicory | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 28 – Aug 9 | 60–85 |
| Chinese Cabbage | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | 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 | Aug 4 | May 10 – May 31 | 14–21 |
| Crookneck Squash | Mar 22 | May 3 | May 10 | — | Jun 28 – Jul 26 | 45–60 |
| Crosne | — | Apr 12 | — | Aug 4 | Sep 13 – Sep 27 | 150–200 |
| Cucumber | Mar 22 | May 3 | May 10 | — | Jul 5 – Aug 30 | 50–70 |
| Daikon | — | Apr 12 | — | Aug 4 | 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 | Aug 4 | Jun 14 – Jul 19 | 45–65 |
| Escarole | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 21 – Jul 19 | 50–70 |
| Fava Beans | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 12 – Aug 23 | 75–100 |
| Fennel | Mar 1 | May 3 | May 10 | — | Jul 12 – Aug 23 | 60–90 |
| Garlic | — | — | — | Sep 1 | Dec 1 – Feb 16 | 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 | Aug 4 | Jun 14 – Jul 12 | 45–60 |
| Kale | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 21 – Aug 16 | 50–70 |
| Kidney Beans | — | May 3 | — | — | Aug 2 – Sep 6 | 85–110 |
| Kohlrabi | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 14 – Jul 19 | 45–65 |
| Komatsuna | Mar 22 | Apr 12 | Apr 26 | Aug 4 | May 31 – Jul 5 | 35–50 |
| Leeks | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 26 – Oct 11 | 90–150 |
| Lentils | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 19 – Aug 30 | 80–110 |
| Lettuce | Mar 22 | Apr 12 | Apr 26 | Aug 4 | May 31 – Aug 9 | 30–60 |
| Lima Beans | — | May 3 | — | — | Jul 5 – Aug 16 | 60–90 |
| Mache | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | May 3 – May 31 | 7–21 |
| Mitsuba | Mar 22 | Apr 12 | Apr 19 | Aug 4 | Jun 14 – Aug 9 | 50–70 |
| Mizuna | Mar 22 | Apr 12 | Apr 26 | Aug 4 | May 31 – Jun 28 | 30–45 |
| Mustard Greens | Mar 22 | Apr 12 | Apr 26 | Aug 4 | May 31 – Aug 2 | 30–50 |
| Napa Cabbage | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | Jul 26 – Sep 13 | 90–120 |
| Pac Choi | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 7 – Jul 5 | 40–55 |
| Parsnip | — | Apr 12 | — | Aug 4 | 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 | Aug 4 | 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 | Aug 4 | Jun 7 – Jul 12 | 40–60 |
| Radicchio | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jun 28 – Aug 2 | 60–80 |
| Radish | — | Apr 12 | — | Aug 4 | May 10 – May 31 | 22–35 |
| Rhubarb | — | — | May 17 | — | — | 365–730 |
| Romanesco | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 12 – Aug 23 | 75–100 |
| Rutabaga | — | Apr 12 | — | Aug 4 | Jul 5 – Aug 9 | 80–100 |
| Salsify | — | Apr 12 | — | Aug 4 | Jul 26 – Sep 6 | 100–130 |
| Savoy Cabbage | Mar 22 | Apr 12 | Apr 26 | Aug 4 | Jul 5 – Aug 30 | 70–110 |
| Scallions | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 | Aug 4 | 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 | Aug 4 | 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 | Aug 4 | 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 |
| 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 | Aug 4 | 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 | — | Aug 4 | May 24 – Jun 28 | 40–60 |
| Watercress | Mar 22 | Apr 12 | Apr 26 | Aug 4 | 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 Rock County
27 fruits that grow well in Zone 5b with planting dates for Rock County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | 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 Rock County
34 herbs that grow well in Zone 5b with planting dates for Rock County.
Show all 34 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 22 | Apr 12 | Apr 19 | Aug 4 | — | 365–730 |
| Anise | Mar 22 | Apr 12 | Apr 19 | Aug 4 | 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 | Aug 4 | Jun 14 – Aug 2 | 50–60 |
| Caraway | Mar 22 | Apr 12 | Apr 19 | Aug 4 | — | 365–450 |
| Catnip | — | — | May 3 | — | Jul 5 – Sep 6 | 60–80 |
| Chamomile | Mar 22 | Apr 12 | Apr 19 | Aug 4 | Jun 21 – Aug 30 | 60–90 |
| Chervil | Mar 22 | Apr 12 | Apr 19 | Aug 4 | May 31 – Aug 2 | 40–60 |
| Chives | — | — | May 3 | — | Jul 5 – Sep 13 | 60–90 |
| Cilantro | Mar 22 | Apr 12 | Apr 19 | Aug 4 | May 31 – Aug 2 | 40–60 |
| Comfrey | — | — | May 3 | — | Jul 5 – Sep 13 | 60–90 |
| Cumin | Mar 22 | Apr 12 | Apr 19 | Aug 4 | Aug 2 – Oct 4 | 100–120 |
| Dill | Mar 22 | Apr 12 | Apr 19 | Aug 4 | May 31 – Aug 2 | 40–60 |
| Epazote | Mar 8 | May 3 | May 10 | — | Jun 28 – Aug 23 | 45–60 |
| Fennel (herb) | Mar 22 | Apr 12 | Apr 19 | Aug 4 | 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 |
| 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 | Aug 4 | 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 | Aug 4 | 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 |
🌸 Flowers to Grow in Rock County
51 flowers that grow well in Zone 5b with planting dates for Rock County.
Show all 51 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 8 | May 3 | May 3 | — | Jun 28 – Sep 27 | 60–75 |
| Alliums | — | — | — | Sep 1 | Oct 6 – Oct 27 | 28–42 |
| Anemones | Mar 29 | — | Apr 26 | — | May 31 – Jun 28 | 90–120 |
| Astilbe | Feb 22 | — | May 10 | — | Jul 26 – Oct 4 | 70–100 |
| Bachelor's Button | Mar 15 | Apr 5 | Apr 26 | — | Jun 28 – Sep 13 | 60–90 |
| Begonias | Feb 15 | — | May 3 | — | Jul 12 – Oct 4 | 70–90 |
| Black-eyed Susan | Feb 22 | Apr 26 | May 10 | — | Jul 26 – Nov 1 | 60–80 |
| Bleeding Hearts | Feb 22 | — | May 10 | — | Jul 5 – Aug 16 | 60–90 |
| Calendula | Mar 15 | Apr 5 | Apr 26 | — | Jun 14 – Sep 13 | 50–70 |
| Celosia | Mar 22 | May 3 | May 3 | — | Jul 5 – Oct 11 | 60–90 |
| Columbine | Feb 22 | May 10 | May 10 | — | Jul 5 – Aug 16 | 70–100 |
| Coreopsis | Feb 22 | May 3 | May 10 | — | Jul 19 – Nov 1 | 60–80 |
| Cosmos | Mar 29 | Apr 26 | Apr 26 | — | Jul 5 – Oct 4 | 60–90 |
| Crocus | — | — | — | Sep 1 | Jul 14 – Aug 4 | 10–20 |
| Daffodils | — | — | — | Sep 1 | Jul 21 – Aug 11 | 20–40 |
| Dahlias | Mar 29 | May 3 | May 3 | — | Jul 26 – Oct 25 | 70–120 |
| Daylily | Feb 22 | — | May 10 | — | Aug 2 – Nov 1 | 60–90 |
| Dianthus | Feb 22 | Mar 29 | Apr 12 | — | May 31 – Aug 23 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 22 | May 10 | May 10 | — | Aug 2 – Nov 1 | 70–90 |
| Foxglove | Feb 22 | May 10 | May 10 | — | Jul 5 – Aug 16 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 1 | May 3 | May 3 | — | Jul 12 – Nov 1 | 70–100 |
| Geraniums | Feb 15 | — | May 3 | — | Jul 12 – Oct 4 | 70–100 |
| Gladiolus | — | May 3 | May 3 | — | Jul 26 – Oct 25 | 70–100 |
| Hostas | Feb 15 | — | May 10 | — | Aug 2 – Nov 1 | 60–90 |
| Hyacinths | — | — | — | Sep 1 | Aug 11 – Sep 8 | 14–28 |
| Hydrangeas | Feb 15 | — | May 10 | — | Jul 26 – Oct 18 | 90–150 |
| Impatiens | Mar 1 | — | May 3 | — | Jul 12 – Oct 11 | 60–75 |
| Irises | — | Division | May 10 | — | Jul 5 – Aug 9 | 60–100 |
| Larkspur | — | Mar 29 | — | — | Jun 7 – Aug 2 | 60–90 |
| Lavender | Feb 15 | — | May 17 | — | Jul 26 – Sep 13 | 90–120 |
| Lilies | — | Division | May 10 | — | Jul 19 – Oct 18 | 70–120 |
| Lobelia | Feb 15 | — | Apr 19 | — | Jun 14 – Aug 30 | 70–80 |
| Lupine | Feb 22 | May 10 | May 10 | — | Jul 5 – Aug 16 | 75–100 |
| Marigolds | Mar 15 | May 3 | May 3 | — | Jun 28 – Sep 27 | 50–70 |
| Nasturtium | Mar 29 | May 3 | May 3 | — | Jun 28 – Oct 11 | 55–65 |
| Pansy | Feb 15 | — | Apr 26 | — | Jun 21 – Aug 23 | 70–90 |
| Peonies | — | Division | May 10 | — | Jul 19 – Aug 30 | 90–120 |
| Petunia | Mar 1 | — | May 3 | — | Jul 12 – Oct 11 | 70–90 |
| Phlox | Feb 22 | May 10 | May 10 | — | Jul 26 – Oct 18 | 80–110 |
| Portulaca | Mar 22 | May 3 | May 3 | — | Jun 21 – Sep 27 | 50–70 |
| Roses | Feb 15 | — | May 10 | — | Jul 26 – Nov 1 | 90–180 |
| Salvia | Feb 22 | — | May 3 | — | Jul 12 – Oct 11 | 70–90 |
| Sedum (Stonecrop) | Feb 22 | — | May 10 | — | Sep 6 – Nov 15 | 60–90 |
| Snapdragon | Feb 15 | Apr 12 | Apr 26 | — | Jul 5 – Sep 13 | 70–100 |
| Sunflower | Apr 5 | May 3 | May 3 | — | Jul 26 – Oct 11 | 70–100 |
| Sweet Alyssum | Mar 8 | Apr 12 | Apr 26 | — | Jun 7 – Aug 16 | 45–60 |
| Sweet Pea | Mar 15 | Mar 22 | Apr 26 | — | Jul 12 – Sep 13 | 65–85 |
| Tulips | — | — | — | Sep 1 | Aug 4 – Aug 25 | 15–30 |
| Vinca (Annual) | Feb 8 | — | May 3 | — | Jul 12 – Oct 4 | 70–90 |
| Yarrow | Feb 22 | Apr 26 | May 10 | — | Jul 19 – Nov 1 | 60–90 |
| Zinnia | Mar 29 | May 3 | May 3 | — | Jul 12 – Oct 11 | 60–70 |
Monthly Planting Guide for Rock County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Rock County.
Frequently Asked Questions
What planting zone is Rock County, WI?
Rock County is in USDA Hardiness Zone 5b. 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 Rock County, WI?
Based on 31 years of NOAA weather station data, the median last spring frost in Rock County falls around April 26. In 8 out of 10 years, last frost lands between April 14 and May 11 — a 27-day window of variability. Use May 11 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Rock County, WI?
The median first fall frost in Rock 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 Rock County?
Rock 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 2.25 days per decade.
What is the soil like in Rock County for gardening?
Rock County has predominantly Silt Loam soil with a pH range of 6.2–7.1 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Rock County?
Rock 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 Rock County a good location for home gardening?
Rock County scores 59/100 (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.
Your Rock County Garden Planner — Free
A 22-page printable planner built for Rock County (Zone 5b). 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