Isanti County, MN — Planting Guide
August in the garden — Isanti County, Minnesota
August rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Isanti County, Minnesota.
-
It's harvest week for basil, carrots, and cucumber
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
-
Direct-sow alliums, crocus, and daffodils for cool weather
Your first frost is about 7 weeks away — plenty of time for these to mature.
A few tasks this August that'll pay off in September
- First harvests: basil, cucumber, and green beans
Isanti County is in USDA Zone 4b. The average last spring frost is May 3 and the first fall frost is October 1, giving you a growing season of approximately 151 days.
At an elevation of 514 ft, Isanti County receives approximately 33.7 in of rainfall annually. Summer highs average 81°F with winter lows around 9°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 25 days year to year — ranging from April 24 in warm years to May 19 in cold years. The growing season is trending longer by about 1.58 days per decade. Isanti County scores 68/100 (Good) on the Microclimate Index.
🌡️ Zone
4b (-25°F to -20°F min)
❄️ Last Frost
May 3
🍂 First Frost
October 1
📅 Growing Season
151 days
⛰️ Elevation
514 ft
🌧️ Annual Rainfall
33.7 in
Monthly Watering Calendar for Isanti 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 math is simple: 1 inch of rainfall delivers ~600 gallons to a 1,000 sq ft garden. Isanti County's 34" annual rainfall covers some months entirely; others need a few hours of drip irrigation per week. The calendar tells you which is which.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.3 in | 7 days | — | None |
| Feb | 1.4 in | 7 days | — | None |
| Mar | 2.6 in | 9 days | — | None |
| Apr | 2.9 in | 8 days | 1.4 in | Moderate |
| May | 3.3 in | 12 days | 1 in | Moderate |
| Jun | 4.7 in | 9 days | — | Low |
| Jul | 3.9 in | 8 days | 0.4 in | Low |
| Aug | 3.5 in | 9 days | 0.8 in | Moderate |
| Sep | 3.2 in | 7 days | 1.1 in | Moderate |
| Oct | 2.4 in | 8 days | 1.9 in | High |
| Nov | 2.5 in | 7 days | — | None |
| Dec | 2.1 in | 7 days | — | None |
Annual total: 33.8 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.
Isanti County Soil Profile
Soil Type
Silt Loam
Soil pH
5.8-7
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 15 | 149 days |
| Cautious | May 12 | Oct 8 | 149 days |
| Average year | May 3 | Oct 1 | 151 days |
| Optimistic | Apr 28 | Sep 23 | 148 days |
| Aggressive (risky) | Apr 24 | Sep 14 | 143 days |
Not very — frost dates can vary by ±25 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 1.6 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Isanti County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Isanti 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 Isanti County's climate and soil.
County Extension Office
Isanti 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 Isanti County
Finding local nurseries & garden centers in Isanti County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Isanti 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 Isanti County MN" or "garden center Isanti 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 Isanti County MN" or check your extension office and local parks department. Facebook groups like "Isanti 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 Isanti County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why this matters: A 14-hour day in June produces dramatically more photosynthesis than a 10-hour day in November. Isanti County's seasonal swing determines which crops can pack growth into spring vs. limp through fall.
Longest Day
15.5 hours
Summer solstice daylight
Shortest Day
8.5 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 | 8.9 hr | 3.4 hr | Short day |
| February | 10.1 hr | 4.4 hr | Short day |
| March | 11.6 hr | 5.4 hr | Short day |
| April | 13.3 hr | 7.1 hr | Neutral |
| May | 14.7 hr | 8.8 hr | Long day |
| June | 15.5 hr | 9.8 hr | Long day |
| July | 15.2 hr | 9.5 hr | Long day |
| August | 13.9 hr | 8.3 hr | Neutral |
| September | 12.3 hr | 6.8 hr | Neutral |
| October | 10.7 hr | 5.8 hr | Short day |
| November | 9.2 hr | 3.8 hr | Short day |
| December | 8.5 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 in Isanti County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
What this means for you: Watching soil temperature (not air) is the single biggest upgrade most new gardeners can make. Isanti County's typical curve helps you plan — but a $5 soil thermometer in the bed beats any average.
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 | 23°F | ❄️ Dormant | ~36 weeks |
| Feb | 15°F | 23°F | ❄️ Dormant | ~36 weeks |
| Mar | 27°F | 29°F | ❄️ Dormant | ~36 weeks |
| Apr | 40°F | 38°F | ❄️ Dormant | ~36 weeks |
| May | 52°F | 52°F | ♻️ Active | ~14 weeks |
| Jun | 66°F | 59°F | 🔥 Peak | ~8 weeks |
| Jul | 73°F | 66°F | 🔥 Peak | ~8 weeks |
| Aug | 73°F | 70°F | 🔥 Peak | ~8 weeks |
| Sep | 66°F | 63°F | 🔥 Peak | ~8 weeks |
| Oct | 51°F | 55°F | ♻️ Active | ~14 weeks |
| Nov | 38°F | 43°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 Isanti County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Why this matters: Two gardeners can grow identical seeds and get wildly different results based on pest pressure alone. Isanti County's climate sets a floor on what's possible without intervention.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
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 | Moderate | May, Jun, Jul |
| Slugs | Low | May, Jun, Jul, Aug, Sep |
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 Isanti County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Why this matters: Cover crops protect microbial life through winter and summer. Bare soil bakes; covered soil stays cooler, moister, and biologically active. The difference shows up in next year's crops.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 14 | Jul 23 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 8 | Jul 23 | ✓ 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 14 | Sep 17 | — | 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 3 | Apr 12 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 14 | Apr 19 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 22 | Apr 12 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 30 | Apr 12 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 8 | Apr 19 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Isanti County
Why this matters: Wind shapes the garden you don't think about: bee paths, evaporation, structural stress on tomato cages. Isanti County's 8.9 mph background level is a baseline you should know before placing the tallest crops (sunflowers, pole beans, sweet corn).
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 11 mph Summer: 9 mph
Fall: 9 mph Winter: 13 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
5.4/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (230 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Isanti County
How much water you can collect, when to collect it, and what size system you need for your garden.
Why this matters: A 1,000 sq ft roof captures about 600 gallons from a single 1" rainfall. Isanti County gets 34" of rain a year — a couple of well-placed rain barrels can cover most summer watering. In dry climates the math's even better: every captured gallon is one you don't buy.
Annual Collection
16,845 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 33.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 16,845 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 Isanti County
Soil Type
Silt Loam
Soil pH 5.8–7 · 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. (33.7 in. annual rainfall)
Season Tips
151-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 Isanti County
95 vegetables that grow well in Zone 4b with planting dates for Isanti County.
Show all 95 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 22 | May 17 | May 24 | — | Aug 16 – Sep 20 | 80–100 |
| Amaranth | Mar 1 | May 17 | May 24 | — | Aug 23 – Oct 11 | 90–120 |
| Arugula | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Aug 9 | 30–50 |
| Asparagus | — | — | May 17 | — | — | 730–1095 |
| Beets | — | Apr 26 | — | Jul 9 | Jun 21 – Jul 19 | 50–70 |
| Belgian Endive | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 23 – Sep 27 | 110–150 |
| Black Beans | — | May 17 | — | — | Aug 16 – Oct 4 | 90–120 |
| Bok Choy | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 19 | 40–60 |
| Broccoli | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 5 – Aug 16 | 60–90 |
| Broccoli Rabe | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 19 | 40–60 |
| Brussels Sprouts | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 2 – Sep 27 | 90–130 |
| Butternut Squash | Mar 22 | May 17 | May 24 | — | Aug 23 – Sep 27 | 85–110 |
| Cabbage | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 5 – Aug 30 | 60–100 |
| Carrots | — | Apr 26 | — | Jul 9 | Jun 28 – Aug 2 | 60–80 |
| Cauliflower | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 30 | 55–100 |
| Celeriac | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 16 – Sep 20 | 100–120 |
| Celery | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 26 – Sep 20 | 80–120 |
| Celtuce | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 5 – Aug 16 | 60–90 |
| Chard | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 16 | 50–60 |
| Chickpeas | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 26 – Sep 6 | 80–110 |
| Chicory | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 5 – Aug 16 | 60–85 |
| Chinese Cabbage | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Jul 26 | 50–70 |
| Christmas Lima Beans | Mar 1 | May 17 | May 24 | — | Aug 16 – Sep 20 | 80–100 |
| Collard Greens | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 30 | 55–75 |
| Corn | — | May 17 | — | — | Jul 19 – Sep 13 | 60–100 |
| Cress | Mar 22 | Apr 26 | May 3 | Jul 9 | May 17 – Jun 7 | 14–21 |
| Crookneck Squash | Mar 22 | May 17 | May 24 | — | Jul 12 – Aug 9 | 45–60 |
| Crosne | — | Apr 26 | — | Jul 9 | Sep 27 – Sep 20 | 150–200 |
| Cucumber | Mar 22 | May 17 | May 24 | — | Jul 19 – Sep 13 | 50–70 |
| Daikon | — | Apr 26 | — | Jul 9 | Jun 21 – Jul 19 | 50–70 |
| Delicata Squash | Mar 22 | May 17 | May 24 | — | Aug 16 – Sep 20 | 80–100 |
| Edamame | — | May 17 | — | — | Aug 2 – Sep 13 | 75–100 |
| Endive | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 21 – Jul 26 | 45–65 |
| Escarole | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Jul 26 | 50–70 |
| Fava Beans | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 19 – Aug 30 | 75–100 |
| Fennel | Mar 1 | May 17 | May 24 | — | Jul 26 – Sep 6 | 60–90 |
| Garlic | — | — | — | Aug 20 | Nov 19 – Jan 14 | 90–240 |
| Green Beans | — | May 17 | — | — | Jul 12 – Sep 6 | 50–65 |
| Horseradish | — | — | May 17 | — | Sep 20 – Oct 11 | 120–180 |
| Hubbard Squash | Mar 22 | May 17 | May 24 | — | Sep 6 – Oct 11 | 100–120 |
| Kabocha | Mar 22 | May 17 | May 24 | — | Aug 23 – Sep 20 | 85–100 |
| Kai Lan | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 21 – Jul 19 | 45–60 |
| Kale | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 23 | 50–70 |
| Kidney Beans | — | May 17 | — | — | Aug 16 – Sep 20 | 85–110 |
| Kohlrabi | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 21 – Jul 26 | 45–65 |
| Komatsuna | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Jul 12 | 35–50 |
| Leeks | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 2 – Sep 27 | 90–150 |
| Lentils | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 26 – Sep 6 | 80–110 |
| Lettuce | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Aug 16 | 30–60 |
| Lima Beans | — | May 17 | — | — | Jul 19 – Aug 30 | 60–90 |
| Mache | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 19 | 40–60 |
| Melon | Mar 22 | May 17 | May 24 | — | Aug 2 – Sep 20 | 70–100 |
| Microgreens | Mar 22 | Apr 26 | May 3 | Jul 9 | May 10 – Jun 7 | 7–21 |
| Mitsuba | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 21 – Aug 16 | 50–70 |
| Mizuna | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Jul 5 | 30–45 |
| Mustard Greens | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Aug 9 | 30–50 |
| Napa Cabbage | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 2 | 55–75 |
| Onion | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 2 – Sep 20 | 90–120 |
| Pac Choi | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 12 | 40–55 |
| Parsnip | — | Apr 26 | — | Jul 9 | Aug 9 – Sep 20 | 100–130 |
| Patty Pan Squash | Mar 22 | May 17 | May 24 | — | Jul 12 – Aug 9 | 45–60 |
| Peas | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 23 | 55–70 |
| Peppers | Feb 15 | May 17 | May 24 | — | Jul 26 – Oct 4 | 60–90 |
| Pole Beans | Mar 1 | May 17 | May 24 | — | Jul 19 – Sep 13 | 55–70 |
| Potatoes | Mar 1 | May 17 | May 24 | — | Aug 2 – Oct 11 | 70–120 |
| Pumpkin | Mar 22 | May 17 | May 24 | — | Aug 23 – Oct 11 | 85–120 |
| Purslane | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 19 | 40–60 |
| Radicchio | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 5 – Aug 9 | 60–80 |
| Radish | — | Apr 26 | — | Jul 9 | May 24 – Jun 14 | 22–35 |
| Rhubarb | — | — | May 31 | — | — | 365–730 |
| Romanesco | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 19 – Aug 30 | 75–100 |
| Rutabaga | — | Apr 26 | — | Jul 9 | Jul 19 – Aug 23 | 80–100 |
| Salsify | — | Apr 26 | — | Jul 9 | Aug 9 – Sep 20 | 100–130 |
| Savoy Cabbage | Mar 22 | Apr 26 | May 3 | Jul 9 | Jul 12 – Sep 6 | 70–110 |
| Scallions | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Jul 26 | 50–70 |
| Scarlet Runner Beans | Mar 1 | May 17 | May 24 | — | Jul 26 – Aug 30 | 60–80 |
| Shallot | Mar 22 | Apr 26 | May 3 | Jul 9 | Aug 2 – Sep 20 | 90–120 |
| Shiso | Mar 8 | May 10 | May 24 | — | Jul 19 – Sep 13 | 50–70 |
| Snap Peas | Mar 1 | May 17 | May 24 | — | Jul 19 – Sep 13 | 55–70 |
| Snow Peas | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 28 – Aug 23 | 50–65 |
| Soybeans | — | May 17 | — | — | Aug 9 – Oct 4 | 80–120 |
| Spaghetti Squash | Mar 22 | May 17 | May 24 | — | Aug 23 – Sep 20 | 85–100 |
| Spinach | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Aug 9 | 35–50 |
| Squash (Summer) | Mar 22 | May 17 | May 24 | — | Jul 12 – Sep 13 | 45–65 |
| Squash (Winter) | Mar 22 | May 17 | May 24 | — | Aug 16 – Oct 11 | 80–120 |
| Sunchoke | — | — | May 17 | — | Sep 6 – Oct 11 | 110–150 |
| Sweet Corn | — | May 17 | — | — | Jul 19 – Aug 30 | 60–90 |
| Tatsoi | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 7 – Jul 12 | 35–50 |
| Tomatillo | Mar 1 | May 17 | May 24 | — | Jul 26 – Oct 4 | 60–85 |
| Tomatoes | Mar 1 | May 17 | May 24 | — | Jul 26 – Oct 4 | 60–85 |
| Turnip | — | Apr 26 | — | Jul 9 | Jun 7 – Jul 12 | 40–60 |
| Watercress | Mar 22 | Apr 26 | May 3 | Jul 9 | Jun 14 – Jul 19 | 40–60 |
| Watermelon | Mar 22 | May 17 | May 24 | — | Aug 2 – Sep 20 | 70–100 |
| Wax Beans | — | May 17 | — | — | Jul 12 – Sep 6 | 50–65 |
| Zucchini | Mar 22 | May 17 | May 24 | — | Jul 12 – Sep 6 | 45–60 |
🍓 Fruits to Grow in Isanti County
22 fruits that grow well in Zone 4b with planting dates for Isanti County.
Show all 22 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 31 | — | Aug 30 – Oct 25 | 90–180 |
| Aronia | — | — | May 31 | — | — | 730–1095 |
| Blueberries | — | — | May 31 | — | — | 730–1095 |
| Cantaloupe | — | — | May 31 | — | Aug 9 – Sep 13 | 70–90 |
| Cranberries | — | — | May 31 | — | — | 730–1095 |
| Currants | — | — | May 31 | — | — | 730–1095 |
| Elderberries | — | — | May 31 | — | — | 730–1095 |
| Goji Berries | — | — | May 31 | — | — | 730–1095 |
| Gooseberries | — | — | May 31 | — | — | 730–1095 |
| Grapes | — | — | May 31 | — | — | 730–1095 |
| Ground Cherry | — | — | May 31 | — | Aug 9 – Oct 4 | 65–80 |
| Hardy Kiwi | — | — | May 31 | — | — | 1095–1825 |
| Haskaps | — | — | May 31 | — | — | 730–1095 |
| Honeydew | — | — | May 31 | — | Aug 23 – Oct 4 | 80–110 |
| Jostaberry | — | — | May 31 | — | — | 730–1095 |
| Lingonberries | — | — | May 31 | — | — | 730–1095 |
| Medlar | — | — | May 31 | — | — | 1095–1825 |
| Mulberries | — | — | May 31 | — | — | 730–1825 |
| Persimmon | — | — | May 31 | — | — | 1095–2555 |
| Raspberries | — | — | May 31 | — | — | 365–730 |
| Serviceberries | — | — | May 31 | — | — | 730–1095 |
| Strawberries | — | — | May 31 | — | Aug 30 – Oct 25 | 90–365 |
🌿 Herbs to Grow in Isanti County
30 herbs that grow well in Zone 4b with planting dates for Isanti County.
Show all 30 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 22 | Apr 26 | Apr 26 | Jul 9 | — | 365–730 |
| Anise | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jul 26 – Sep 20 | 90–120 |
| Basil | Mar 8 | May 10 | May 24 | — | Jul 19 – Sep 20 | 50–75 |
| Bee Balm | — | — | May 10 | — | Aug 9 – Oct 4 | 90–120 |
| Borage | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 21 – Aug 9 | 50–60 |
| Caraway | Mar 22 | Apr 26 | Apr 26 | Jul 9 | — | 365–450 |
| Catnip | — | — | May 10 | — | Jul 12 – Sep 13 | 60–80 |
| Chamomile | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 28 – Sep 6 | 60–90 |
| Chervil | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 7 – Aug 9 | 40–60 |
| Chives | — | — | May 10 | — | Jul 12 – Sep 20 | 60–90 |
| Cilantro | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 7 – Aug 9 | 40–60 |
| Comfrey | — | — | May 10 | — | Jul 12 – Sep 20 | 60–90 |
| Dill | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 7 – Aug 9 | 40–60 |
| Fennel (herb) | Mar 22 | Apr 26 | Apr 26 | Jul 9 | Jun 28 – Sep 6 | 60–90 |
| 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 |
| Lemon Balm | — | — | May 10 | — | Jul 12 – Aug 30 | 60–70 |
| 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 22 | Apr 26 | Apr 26 | Jul 9 | 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 22 | Apr 26 | Apr 26 | Jul 9 | Jun 7 – Aug 9 | 40–60 |
| Tarragon | — | — | May 10 | — | Jul 12 – Sep 20 | 60–90 |
| Thai Basil | Mar 8 | May 10 | May 24 | — | Jul 19 – Sep 20 | 50–75 |
| Thyme | — | — | May 10 | — | Jul 19 – Sep 20 | 70–90 |
| Valerian | — | — | May 10 | — | Sep 13 – Oct 4 | 120–180 |
🌸 Flowers to Grow in Isanti County
49 flowers that grow well in Zone 4b with planting dates for Isanti County.
Show all 49 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 15 | May 10 | May 10 | — | Jul 5 – Sep 20 | 60–75 |
| Alliums | — | — | — | Aug 20 | Sep 24 – Oct 22 | 28–42 |
| Astilbe | Feb 22 | — | May 17 | — | Aug 9 – Oct 4 | 70–100 |
| Bachelor's Button | Mar 15 | Apr 19 | May 3 | — | Jul 5 – Sep 6 | 60–90 |
| Begonias | Feb 15 | — | May 10 | — | Jul 19 – Sep 27 | 70–90 |
| Black-eyed Susan | Feb 22 | May 3 | May 17 | — | Aug 9 – Oct 25 | 60–80 |
| Bleeding Hearts | Feb 22 | — | May 17 | — | Jul 12 – Aug 23 | 60–90 |
| Calendula | Mar 15 | Apr 19 | May 3 | — | Jun 21 – Sep 6 | 50–70 |
| Celosia | Mar 29 | May 17 | May 17 | — | Jul 19 – Oct 4 | 60–90 |
| Columbine | Feb 22 | May 17 | May 17 | — | Jul 12 – Aug 30 | 70–100 |
| Coreopsis | Feb 22 | May 10 | May 17 | — | Aug 2 – Oct 25 | 60–80 |
| Cosmos | Apr 5 | May 10 | May 10 | — | Jul 19 – Oct 11 | 60–90 |
| Crocus | — | — | — | Aug 20 | Jun 25 – Jul 23 | 10–20 |
| Daffodils | — | — | — | Aug 20 | Jul 2 – Jul 30 | 20–40 |
| Dahlias | Apr 5 | May 17 | May 17 | — | Aug 16 – Oct 25 | 70–120 |
| Daylily | Feb 22 | — | May 17 | — | Aug 16 – Oct 25 | 60–90 |
| Dianthus | Mar 1 | Apr 12 | Apr 26 | — | Jun 14 – Aug 23 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 22 | May 17 | May 17 | — | Aug 16 – Oct 25 | 70–90 |
| Foxglove | Feb 22 | May 17 | May 17 | — | Jul 12 – Aug 23 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 8 | May 17 | May 17 | — | Jul 26 – Nov 1 | 70–100 |
| Geraniums | Feb 15 | — | May 10 | — | Jul 19 – Sep 27 | 70–100 |
| Gladiolus | — | May 10 | May 10 | — | Aug 9 – Oct 18 | 70–100 |
| Hostas | Feb 15 | — | May 17 | — | Aug 16 – Oct 25 | 60–90 |
| Hyacinths | — | — | — | Aug 20 | Jul 23 – Aug 13 | 14–28 |
| Hydrangeas | Feb 15 | — | May 17 | — | Aug 9 – Oct 11 | 90–150 |
| Impatiens | Mar 1 | — | May 17 | — | Aug 2 – Oct 4 | 60–75 |
| Irises | — | Division | May 17 | — | Jul 12 – Aug 16 | 60–100 |
| Larkspur | — | Apr 5 | — | — | Jun 14 – Aug 2 | 60–90 |
| Lilies | — | Division | May 17 | — | Aug 9 – Oct 11 | 70–120 |
| Lobelia | Feb 22 | — | May 3 | — | Jun 28 – Aug 30 | 70–80 |
| Lupine | Feb 22 | May 17 | May 17 | — | Jul 12 – Aug 23 | 75–100 |
| Marigolds | Mar 22 | May 10 | May 10 | — | Jul 5 – Sep 20 | 50–70 |
| Nasturtium | Apr 5 | May 10 | May 10 | — | Jul 5 – Sep 27 | 55–65 |
| Pansy | Feb 15 | — | May 3 | — | Jun 28 – Aug 16 | 70–90 |
| Peonies | — | Division | May 17 | — | Jul 26 – Aug 30 | 90–120 |
| Petunia | Mar 1 | — | May 10 | — | Jul 19 – Oct 4 | 70–90 |
| Phlox | Feb 22 | May 17 | May 17 | — | Aug 9 – Oct 18 | 80–110 |
| Portulaca | Mar 29 | May 17 | May 17 | — | Jul 5 – Sep 20 | 50–70 |
| Roses | Feb 15 | — | May 17 | — | Aug 9 – Oct 25 | 90–180 |
| Salvia | Mar 1 | — | May 10 | — | Jul 19 – Sep 27 | 70–90 |
| Sedum (Stonecrop) | Feb 22 | — | May 17 | — | Sep 20 – Nov 15 | 60–90 |
| Snapdragon | Feb 22 | — | May 3 | — | Jul 12 – Sep 6 | 70–100 |
| Sunflower | Apr 12 | May 10 | May 10 | — | Aug 2 – Oct 4 | 70–100 |
| Sweet Alyssum | Mar 15 | Apr 26 | May 3 | — | Jun 14 – Aug 16 | 45–60 |
| Sweet Pea | Mar 22 | Mar 29 | May 3 | — | Jul 26 – Sep 13 | 65–85 |
| Tulips | — | — | — | Aug 20 | Jul 16 – Aug 6 | 15–30 |
| Vinca (Annual) | Feb 15 | — | May 17 | — | Jul 26 – Oct 4 | 70–90 |
| Yarrow | Feb 22 | May 3 | May 17 | — | Aug 2 – Oct 25 | 60–90 |
| Zinnia | Apr 5 | May 10 | May 10 | — | Jul 19 – Oct 4 | 60–70 |
Monthly Planting Guide for Isanti County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Isanti County.
Frequently Asked Questions
What planting zone is Isanti County, MN?
Isanti County is in USDA Hardiness Zone 4b. 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 Isanti County, MN?
Based on 31 years of NOAA weather station data, the median last spring frost in Isanti County falls around May 3. In 8 out of 10 years, last frost lands between April 24 and May 19 — a 25-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 Isanti County, MN?
The median first fall frost in Isanti County arrives around October 1. In cold years it can arrive as early as September 14; in mild years as late as October 15. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Isanti County?
Isanti County has a frost-free growing season of approximately 151 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 1.58 days per decade.
What is the soil like in Isanti County for gardening?
Isanti County has predominantly Silt Loam soil with a pH range of 5.8–7 and Excessively Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Isanti County?
Isanti County has commercial agriculture that includes Soybeans, Corn, Hay, Dairy. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Isanti County a good location for home gardening?
Isanti County scores 68/100 (Good) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Conditions here are moderate — most common crops grow well with standard timing and care.
Your Isanti County Garden Planner — Free
A 22-page printable planner built for Isanti County (Zone 4b). 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