Benton County, MN — Planting Guide
July to-do list for Benton County, Minnesota
Here's what deserves your attention in Benton County, Minnesota this month. Everything below is tailored to Zone 4a and timed around your local frost dates.
-
Time to start peppers, pole beans, and tomatoes inside
Starting these indoors now means sturdy transplants ready the moment your soil warms up.
-
Harvest basil, carrots, and cucumber as they ripen
If you can't use it all right away, check the food-preservation section of your planner.
-
Plant your fall garden: carrots, kale, and lettuce
Your first frost is about 10 weeks away — plenty of time for these to mature.
Looking ahead to August
- First harvests: basil, carrots, and cucumber
- Fall sowing: alliums, crocus, and daffodils
Benton County is in USDA Zone 4a. The average last spring frost is May 2 and the first fall frost is October 6, giving you a growing season of approximately 157 days.
At an elevation of 1,178 ft, Benton County receives approximately 39 in of rainfall annually. Summer highs average 84°F with winter lows around 8°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 20 in warm years to May 19 in cold years. Benton County scores 74/100 (Good) on the Microclimate Index.
🌡️ Zone
4a (-30°F to -25°F min)
❄️ Last Frost
May 2
🍂 First Frost
October 6
📅 Growing Season
157 days
⛰️ Elevation
1,178 ft
🌧️ Annual Rainfall
39 in
Monthly Watering Calendar for Benton County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
The practical takeaway: 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. Benton County's 39" annual baseline is the starting point.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.6 in | 7 days | — | None |
| Feb | 1.5 in | 7 days | — | None |
| Mar | 3 in | 8 days | — | None |
| Apr | 3.4 in | 9 days | 0.9 in | Moderate |
| May | 4.1 in | 10 days | 0.2 in | Low |
| Jun | 5 in | 8 days | — | Low |
| Jul | 4.5 in | 7 days | — | Low |
| Aug | 4.2 in | 10 days | 0.1 in | Low |
| Sep | 3.3 in | 7 days | 1 in | Moderate |
| Oct | 3.3 in | 8 days | 1 in | Moderate |
| Nov | 2.7 in | 7 days | — | None |
| Dec | 2.5 in | 7 days | — | None |
Annual total: 39.1 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.
Benton County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7
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 19 | Oct 19 | 153 days |
| Cautious | May 12 | Oct 9 | 150 days |
| Average year | May 2 | Oct 6 | 157 days |
| Optimistic | Apr 26 | Sep 29 | 156 days |
| Aggressive (risky) | Apr 20 | Sep 19 | 152 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.
Slightly — seasons are trending a bit shorter (0.5 days/decade). Stay conservative with planting dates.
Gardening Difficulty Score
Benton County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Benton 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 Benton County's climate and soil.
County Extension Office
Benton County University of Minnesota Extension Extension Office
Phone: 612-625-8173
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 Benton County
Finding local nurseries & garden centers in Benton County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Benton 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 Benton County MN" or "garden center Benton 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 Benton County MN" or check your extension office and local parks department. Facebook groups like "Benton County Gardeners" or "Minnesota 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 Benton County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
What this means for you: Photoperiod-sensitive crops will fail spectacularly if planted at the wrong latitude. Sweet onions in Michigan? Tiny. Spanish onions in Florida? Tiny. Match variety to Benton County's daylight pattern and you'll see the difference.
Longest Day
15.5 hours
Summer solstice daylight
Shortest Day
8.5 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 | 8.9 hr | 3.5 hr | Short day |
| February | 10.1 hr | 4.4 hr | Short day |
| March | 11.6 hr | 5.3 hr | Short day |
| April | 13.3 hr | 7.1 hr | Neutral |
| May | 14.7 hr | 8.8 hr | Long day |
| June | 15.5 hr | 9.5 hr | Long day |
| July | 15.2 hr | 9.5 hr | Long day |
| August | 13.9 hr | 8.4 hr | Neutral |
| September | 12.3 hr | 6.9 hr | Neutral |
| October | 10.7 hr | 5.5 hr | Short day |
| November | 9.2 hr | 3.7 hr | Short day |
| December | 8.5 hr | 3.1 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Benton County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why this matters: Soil temperature predicts plant emergence better than calendar dates. Benton County's spring soil warm-up curve tells you which weeks are safe for direct-sow beans, cucumbers, squash, and corn.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jun through Sep.
Best Month to Compost
Jul
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 | 14°F | 23°F | ❄️ Dormant | ~36 weeks |
| Feb | 14°F | 23°F | ❄️ Dormant | ~36 weeks |
| Mar | 27°F | 28°F | ❄️ Dormant | ~36 weeks |
| Apr | 39°F | 38°F | ❄️ Dormant | ~36 weeks |
| May | 52°F | 50°F | ♻️ Active | ~14 weeks |
| Jun | 64°F | 58°F | ♻️ Active | ~14 weeks |
| Jul | 72°F | 64°F | 🔥 Peak | ~8 weeks |
| Aug | 73°F | 69°F | 🔥 Peak | ~8 weeks |
| Sep | 64°F | 63°F | ♻️ Active | ~14 weeks |
| Oct | 53°F | 55°F | ♻️ Active | ~14 weeks |
| Nov | 37°F | 42°F | ❄️ Dormant | ~36 weeks |
| Dec | 24°F | 30°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 Benton County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Quick context: Pest pressure scales with warmth and humidity. Hot humid Benton County sees year-round bugs and fungal disease; cold dry regions see almost none. A high pest score means crop rotation, resistant varieties, and a weekly pest-watch routine from day one.
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 | Moderate | Jun, Jul, Aug |
| Colorado potato beetle | Moderate | Jun, Jul |
| Flea beetles | Low | 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 Benton County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Why it matters: 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 (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 12 | Jul 28 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 7 | Aug 11 | ✓ 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 18 | Sep 22 | — | 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 26 | Apr 18 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 11 | Apr 11 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 6 | Apr 11 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 7 | Apr 11 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 3 | Apr 11 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Benton County
Quick context: Why care about wind? Above about 10 mph, evaporation jumps and pollinators struggle to land on flowers. Benton County's 8.9 mph average means you can plant tall crops without much support, but it doesn't mean ignore wind — a 20+ mph storm still snaps unstaked tomatoes.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 9 mph
Fall: 9 mph Winter: 13 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.3/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (166 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Benton County
How much water you can collect, when to collect it, and what size system you need for your garden.
Quick context: Rainwater is unchlorinated, unfluoridated, and at ambient temperature — plants actually prefer it. Benton County's 39" annual rainfall means even a small 50-gallon barrel catches enough for a few weeks of garden watering between storms.
Annual Collection
19,487 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, 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 39.1 inches of rain per year
- A 1,000 sq ft roof can collect roughly 19,487 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 Benton County
Soil Type
Silt Loam
Soil pH 6–7 · 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. (39 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 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 Benton County
95 vegetables that grow well in Zone 4a with planting dates for Benton County.
Show all 95 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 21 | May 16 | May 23 | — | Aug 15 – Sep 19 | 80–100 |
| Amaranth | Feb 28 | May 16 | May 23 | — | Aug 22 – Oct 10 | 90–120 |
| Arugula | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Aug 8 | 30–50 |
| Asparagus | — | — | May 16 | — | — | 730–1095 |
| Beets | — | Apr 25 | — | Jul 14 | Jun 20 – Jul 18 | 50–70 |
| Belgian Endive | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 22 – Sep 26 | 110–150 |
| Black Beans | — | May 16 | — | — | Aug 15 – Oct 3 | 90–120 |
| Bok Choy | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 18 | 40–60 |
| Broccoli | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 4 – Aug 15 | 60–90 |
| Broccoli Rabe | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 18 | 40–60 |
| Brussels Sprouts | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 1 – Sep 26 | 90–130 |
| Butternut Squash | Mar 21 | May 16 | May 23 | — | Aug 22 – Sep 26 | 85–110 |
| Cabbage | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 4 – Aug 29 | 60–100 |
| Carrots | — | Apr 25 | — | Jul 14 | Jun 27 – Aug 1 | 60–80 |
| Cauliflower | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 29 | 55–100 |
| Celeriac | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 15 – Sep 19 | 100–120 |
| Celery | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 25 – Sep 19 | 80–120 |
| Celtuce | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 4 – Aug 15 | 60–90 |
| Chard | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 15 | 50–60 |
| Chickpeas | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 25 – Sep 5 | 80–110 |
| Chicory | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 4 – Aug 15 | 60–85 |
| Chinese Cabbage | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Jul 25 | 50–70 |
| Christmas Lima Beans | Feb 28 | May 16 | May 23 | — | Aug 15 – Sep 19 | 80–100 |
| Collard Greens | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 29 | 55–75 |
| Corn | — | May 16 | — | — | Jul 18 – Sep 12 | 60–100 |
| Cress | Mar 21 | Apr 25 | May 2 | Jul 14 | May 16 – Jun 6 | 14–21 |
| Crookneck Squash | Mar 21 | May 16 | May 23 | — | Jul 11 – Aug 8 | 45–60 |
| Crosne | — | Apr 25 | — | Jul 14 | Sep 26 – Sep 19 | 150–200 |
| Cucumber | Mar 21 | May 16 | May 23 | — | Jul 18 – Sep 12 | 50–70 |
| Daikon | — | Apr 25 | — | Jul 14 | Jun 20 – Jul 18 | 50–70 |
| Delicata Squash | Mar 21 | May 16 | May 23 | — | Aug 15 – Sep 19 | 80–100 |
| Edamame | — | May 16 | — | — | Aug 1 – Sep 12 | 75–100 |
| Endive | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 20 – Jul 25 | 45–65 |
| Escarole | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Jul 25 | 50–70 |
| Fava Beans | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 18 – Aug 29 | 75–100 |
| Fennel | Feb 28 | May 16 | May 23 | — | Jul 25 – Sep 5 | 60–90 |
| Garlic | — | — | — | Aug 25 | Nov 24 – Jan 19 | 90–240 |
| Green Beans | — | May 16 | — | — | Jul 11 – Sep 5 | 50–65 |
| Horseradish | — | — | May 16 | — | Sep 19 – Oct 10 | 120–180 |
| Hubbard Squash | Mar 21 | May 16 | May 23 | — | Sep 5 – Oct 10 | 100–120 |
| Kabocha | Mar 21 | May 16 | May 23 | — | Aug 22 – Sep 19 | 85–100 |
| Kai Lan | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 20 – Jul 18 | 45–60 |
| Kale | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 22 | 50–70 |
| Kidney Beans | — | May 16 | — | — | Aug 15 – Sep 19 | 85–110 |
| Kohlrabi | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 20 – Jul 25 | 45–65 |
| Komatsuna | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Jul 11 | 35–50 |
| Leeks | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 1 – Sep 26 | 90–150 |
| Lentils | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 25 – Sep 5 | 80–110 |
| Lettuce | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Aug 15 | 30–60 |
| Lima Beans | — | May 16 | — | — | Jul 18 – Aug 29 | 60–90 |
| Mache | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 18 | 40–60 |
| Melon | Mar 21 | May 16 | May 23 | — | Aug 1 – Sep 19 | 70–100 |
| Microgreens | Mar 21 | Apr 25 | May 2 | Jul 14 | May 9 – Jun 6 | 7–21 |
| Mitsuba | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 20 – Aug 15 | 50–70 |
| Mizuna | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Jul 4 | 30–45 |
| Mustard Greens | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Aug 8 | 30–50 |
| Napa Cabbage | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 1 | 55–75 |
| Onion | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 1 – Sep 19 | 90–120 |
| Pac Choi | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 11 | 40–55 |
| Parsnip | — | Apr 25 | — | Jul 14 | Aug 8 – Sep 19 | 100–130 |
| Patty Pan Squash | Mar 21 | May 16 | May 23 | — | Jul 11 – Aug 8 | 45–60 |
| Peas | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 22 | 55–70 |
| Peppers | Feb 14 | May 16 | May 23 | — | Jul 25 – Oct 3 | 60–90 |
| Pole Beans | Feb 28 | May 16 | May 23 | — | Jul 18 – Sep 12 | 55–70 |
| Potatoes | Feb 28 | May 16 | May 23 | — | Aug 1 – Oct 10 | 70–120 |
| Pumpkin | Mar 21 | May 16 | May 23 | — | Aug 22 – Oct 10 | 85–120 |
| Purslane | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 18 | 40–60 |
| Radicchio | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 4 – Aug 8 | 60–80 |
| Radish | — | Apr 25 | — | Jul 14 | May 23 – Jun 13 | 22–35 |
| Rhubarb | — | — | May 30 | — | — | 365–730 |
| Romanesco | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 18 – Aug 29 | 75–100 |
| Rutabaga | — | Apr 25 | — | Jul 14 | Jul 18 – Aug 22 | 80–100 |
| Salsify | — | Apr 25 | — | Jul 14 | Aug 8 – Sep 19 | 100–130 |
| Savoy Cabbage | Mar 21 | Apr 25 | May 2 | Jul 14 | Jul 11 – Sep 5 | 70–110 |
| Scallions | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Jul 25 | 50–70 |
| Scarlet Runner Beans | Feb 28 | May 16 | May 23 | — | Jul 25 – Aug 29 | 60–80 |
| Shallot | Mar 21 | Apr 25 | May 2 | Jul 14 | Aug 1 – Sep 19 | 90–120 |
| Shiso | Mar 7 | May 9 | May 23 | — | Jul 18 – Sep 12 | 50–70 |
| Snap Peas | Feb 28 | May 16 | May 23 | — | Jul 18 – Sep 12 | 55–70 |
| Snow Peas | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 27 – Aug 22 | 50–65 |
| Soybeans | — | May 16 | — | — | Aug 8 – Oct 3 | 80–120 |
| Spaghetti Squash | Mar 21 | May 16 | May 23 | — | Aug 22 – Sep 19 | 85–100 |
| Spinach | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Aug 8 | 35–50 |
| Squash (Summer) | Mar 21 | May 16 | May 23 | — | Jul 11 – Sep 12 | 45–65 |
| Squash (Winter) | Mar 21 | May 16 | May 23 | — | Aug 15 – Oct 10 | 80–120 |
| Sunchoke | — | — | May 16 | — | Sep 5 – Oct 10 | 110–150 |
| Sweet Corn | — | May 16 | — | — | Jul 18 – Aug 29 | 60–90 |
| Tatsoi | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 6 – Jul 11 | 35–50 |
| Tomatillo | Feb 28 | May 16 | May 23 | — | Jul 25 – Oct 3 | 60–85 |
| Tomatoes | Feb 28 | May 16 | May 23 | — | Jul 25 – Oct 3 | 60–85 |
| Turnip | — | Apr 25 | — | Jul 14 | Jun 6 – Jul 11 | 40–60 |
| Watercress | Mar 21 | Apr 25 | May 2 | Jul 14 | Jun 13 – Jul 18 | 40–60 |
| Watermelon | Mar 21 | May 16 | May 23 | — | Aug 1 – Sep 19 | 70–100 |
| Wax Beans | — | May 16 | — | — | Jul 11 – Sep 5 | 50–65 |
| Zucchini | Mar 21 | May 16 | May 23 | — | Jul 11 – Sep 5 | 45–60 |
🍓 Fruits to Grow in Benton County
22 fruits that grow well in Zone 4a with planting dates for Benton County.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 30 | — | Aug 29 – Oct 24 | 90–180 |
| Aronia | — | — | May 30 | — | — | 730–1095 |
| Blueberries | — | — | May 30 | — | — | 730–1095 |
| Cantaloupe | — | — | May 30 | — | Aug 8 – Sep 12 | 70–90 |
| Cranberries | — | — | May 30 | — | — | 730–1095 |
| Currants | — | — | May 30 | — | — | 730–1095 |
| Elderberries | — | — | May 30 | — | — | 730–1095 |
| Goji Berries | — | — | May 30 | — | — | 730–1095 |
| Gooseberries | — | — | May 30 | — | — | 730–1095 |
| Grapes | — | — | May 30 | — | — | 730–1095 |
| Ground Cherry | — | — | May 30 | — | Aug 8 – Oct 3 | 65–80 |
| Hardy Kiwi | — | — | May 30 | — | — | 1095–1825 |
| Haskaps | — | — | May 30 | — | — | 730–1095 |
| Honeydew | — | — | May 30 | — | Aug 22 – Oct 3 | 80–110 |
| Jostaberry | — | — | May 30 | — | — | 730–1095 |
| Lingonberries | — | — | May 30 | — | — | 730–1095 |
| Medlar | — | — | May 30 | — | — | 1095–1825 |
| Mulberries | — | — | May 30 | — | — | 730–1825 |
| Persimmon | — | — | May 30 | — | — | 1095–2555 |
| Raspberries | — | — | May 30 | — | — | 365–730 |
| Serviceberries | — | — | May 30 | — | — | 730–1095 |
| Strawberries | — | — | May 30 | — | Aug 29 – Oct 24 | 90–365 |
🌿 Herbs to Grow in Benton County
30 herbs that grow well in Zone 4a with planting dates for Benton County.
Show all 30 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 21 | Apr 25 | Apr 25 | Jul 14 | — | 365–730 |
| Anise | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jul 25 – Sep 19 | 90–120 |
| Basil | Mar 7 | May 9 | May 23 | — | Jul 18 – Sep 19 | 50–75 |
| Bee Balm | — | — | May 9 | — | Aug 8 – Oct 3 | 90–120 |
| Borage | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 20 – Aug 8 | 50–60 |
| Caraway | Mar 21 | Apr 25 | Apr 25 | Jul 14 | — | 365–450 |
| Catnip | — | — | May 9 | — | Jul 11 – Sep 12 | 60–80 |
| Chamomile | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 27 – Sep 5 | 60–90 |
| Chervil | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 6 – Aug 8 | 40–60 |
| Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cilantro | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 6 – Aug 8 | 40–60 |
| Comfrey | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Dill | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 6 – Aug 8 | 40–60 |
| Fennel (herb) | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 27 – Sep 5 | 60–90 |
| Garlic Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Horehound | — | — | May 9 | — | Jul 25 – Sep 19 | 75–90 |
| Hyssop | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Lemon Balm | — | — | May 9 | — | Jul 11 – Aug 29 | 60–70 |
| Lovage | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Mint | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Oregano | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Parsley | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 27 – Aug 29 | 60–80 |
| Rue | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Sage | — | — | May 9 | — | Jul 25 – Sep 19 | 75–90 |
| Savory | — | — | May 9 | — | Jul 4 – Aug 29 | 50–70 |
| Sorrel | Mar 21 | Apr 25 | Apr 25 | Jul 14 | Jun 6 – Aug 8 | 40–60 |
| Tarragon | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Thai Basil | Mar 7 | May 9 | May 23 | — | Jul 18 – Sep 19 | 50–75 |
| Thyme | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Valerian | — | — | May 9 | — | Sep 12 – Oct 3 | 120–180 |
🌸 Flowers to Grow in Benton County
49 flowers that grow well in Zone 4a with planting dates for Benton County.
Show all 49 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 7 | May 9 | May 9 | — | Jul 4 – Sep 12 | 60–75 |
| Alliums | — | — | — | Aug 25 | Oct 6 – Oct 27 | 28–42 |
| Astilbe | Feb 21 | — | May 16 | — | Aug 8 – Oct 3 | 70–100 |
| Bachelor's Button | Mar 14 | Apr 18 | May 2 | — | Jul 4 – Sep 5 | 60–90 |
| Begonias | Feb 14 | — | May 16 | — | Jul 25 – Sep 26 | 70–90 |
| Black-eyed Susan | Feb 21 | May 2 | May 16 | — | Aug 8 – Oct 17 | 60–80 |
| Bleeding Hearts | Feb 21 | — | May 16 | — | Jul 11 – Aug 22 | 60–90 |
| Calendula | Mar 14 | Apr 18 | May 2 | — | Jun 20 – Sep 5 | 50–70 |
| Celosia | Mar 21 | May 16 | May 16 | — | Jul 18 – Oct 3 | 60–90 |
| Columbine | Feb 21 | May 16 | May 16 | — | Jul 11 – Aug 22 | 70–100 |
| Coreopsis | Feb 21 | May 9 | May 16 | — | Aug 1 – Oct 17 | 60–80 |
| Cosmos | Apr 4 | May 9 | May 9 | — | Jul 18 – Oct 3 | 60–90 |
| Crocus | — | — | — | Aug 25 | Jun 30 – Jul 21 | 10–20 |
| Daffodils | — | — | — | Aug 25 | Jul 7 – Jul 28 | 20–40 |
| Dahlias | Apr 4 | May 16 | May 16 | — | Aug 15 – Oct 17 | 70–120 |
| Daylily | Feb 21 | — | May 16 | — | Aug 15 – Oct 17 | 60–90 |
| Dianthus | Feb 28 | Apr 11 | Apr 25 | — | Jun 13 – Aug 15 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 21 | May 16 | May 16 | — | Aug 15 – Oct 17 | 70–90 |
| Foxglove | Feb 21 | May 16 | May 16 | — | Jul 11 – Aug 22 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 7 | May 16 | May 16 | — | Jul 25 – Oct 24 | 70–100 |
| Geraniums | Feb 14 | — | May 16 | — | Jul 25 – Sep 26 | 70–100 |
| Gladiolus | — | May 9 | May 9 | — | Aug 8 – Oct 10 | 70–100 |
| Hostas | Feb 14 | — | May 16 | — | Aug 15 – Oct 17 | 60–90 |
| Hyacinths | — | — | — | Aug 25 | Jul 28 – Aug 18 | 14–28 |
| Hydrangeas | Feb 14 | — | May 16 | — | Aug 8 – Oct 3 | 90–150 |
| Impatiens | Feb 28 | — | May 16 | — | Aug 1 – Sep 26 | 60–75 |
| Irises | — | Division | May 16 | — | Jul 11 – Aug 8 | 60–100 |
| Larkspur | — | Mar 28 | — | — | Jun 6 – Jul 18 | 60–90 |
| Lilies | — | Division | May 16 | — | Aug 8 – Oct 10 | 70–120 |
| Lobelia | Feb 21 | — | May 2 | — | Jun 27 – Aug 22 | 70–80 |
| Lupine | Feb 21 | May 16 | May 16 | — | Jul 11 – Aug 22 | 75–100 |
| Marigolds | Mar 21 | May 16 | May 16 | — | Jul 11 – Sep 26 | 50–70 |
| Nasturtium | Apr 4 | May 16 | May 16 | — | Jul 11 – Sep 26 | 55–65 |
| Pansy | Feb 14 | — | May 2 | — | Jun 27 – Aug 15 | 70–90 |
| Peonies | — | Division | May 16 | — | Jul 25 – Aug 29 | 90–120 |
| Petunia | Feb 28 | — | May 16 | — | Aug 1 – Oct 3 | 70–90 |
| Phlox | Feb 21 | May 16 | May 16 | — | Aug 8 – Oct 10 | 80–110 |
| Portulaca | Mar 21 | May 16 | May 16 | — | Jul 4 – Sep 12 | 50–70 |
| Roses | Feb 14 | — | May 16 | — | Aug 8 – Oct 17 | 90–180 |
| Salvia | Feb 21 | — | May 16 | — | Jul 25 – Sep 26 | 70–90 |
| Sedum (Stonecrop) | Feb 21 | — | May 16 | — | Sep 19 – Nov 7 | 60–90 |
| Snapdragon | Feb 14 | — | May 2 | — | Jul 11 – Sep 5 | 70–100 |
| Sunflower | Apr 11 | May 16 | May 16 | — | Aug 8 – Oct 3 | 70–100 |
| Sweet Alyssum | Mar 7 | Apr 25 | May 2 | — | Jun 13 – Aug 15 | 45–60 |
| Sweet Pea | Mar 14 | Mar 28 | May 2 | — | Jul 25 – Sep 5 | 65–85 |
| Tulips | — | — | — | Aug 25 | Jul 21 – Aug 11 | 15–30 |
| Vinca (Annual) | Feb 14 | — | May 16 | — | Jul 25 – Sep 26 | 70–90 |
| Yarrow | Feb 21 | May 2 | May 16 | — | Aug 1 – Oct 17 | 60–90 |
| Zinnia | Apr 4 | May 16 | May 16 | — | Jul 25 – Oct 3 | 60–70 |
Monthly Planting Guide for Benton County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Benton County.
Frequently Asked Questions
What planting zone is Benton County, MN?
Benton County is in USDA Hardiness Zone 4a. 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 Benton County, MN?
Based on 31 years of NOAA weather station data, the median last spring frost in Benton County falls around May 2. In 8 out of 10 years, last frost lands between April 20 and May 19 — a 29-day window of variability. Use May 19 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Benton County, MN?
The median first fall frost in Benton County arrives around October 6. In cold years it can arrive as early as September 19; in mild years as late as October 19. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Benton County?
Benton 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.
What is the soil like in Benton County for gardening?
Benton County has predominantly Silt Loam soil with a pH range of 6–7 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Benton County?
Benton County has commercial agriculture that includes Soybeans, Corn, 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 Benton County a good location for home gardening?
Benton County scores 74/100 (Good) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. This is an above-average location for home gardening with relatively predictable growing conditions.
Your Benton County Garden Planner — Free
A 22-page printable planner built for Benton County (Zone 4a). 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