Lyon County, IA — Planting Guide
Your June game plan for Lyon County, Iowa
Here's what deserves your attention in Lyon County, Iowa this month. Everything below is tailored to Zone 5a and timed around your local frost dates.
-
Time to start basil, cucumber, and kale inside
Label every cell. You will absolutely forget which is which otherwise.
-
Harvest carrots, kale, and lettuce as they ripen
Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.
Coming up in July — start thinking about
- Starting indoors: peppers, astilbe, and begonias
- First harvests: basil, carrots, and cucumber
- Fall sowing: carrots, kale, and lettuce
Lyon County is in USDA Zone 5a. The average last spring frost is May 2 and the first fall frost is October 2, giving you a growing season of approximately 153 days.
At an elevation of 1,045 ft, Lyon County receives approximately 30.4 in of rainfall annually. Summer highs average 80°F with winter lows around 4°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 24 days year to year — ranging from April 21 in warm years to May 16 in cold years. The growing season is trending shorter by about 0.57 days per decade. Lyon County scores 72/100 (Good) on the Microclimate Index.
🌡️ Zone
5a (-20°F to -15°F min)
❄️ Last Frost
May 2
🍂 First Frost
October 2
📅 Growing Season
153 days
⛰️ Elevation
1,045 ft
🌧️ Annual Rainfall
30.4 in
Monthly Watering Calendar for Lyon County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
For new gardeners: In Lyon County, the watering question isn't "how often" — it's "is the soil moist 4 inches down?" Stick a finger in. Dry? Water. Damp? Wait. The 30" annual rainfall is just the starting context.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.4 in | 7 days | — | None |
| Feb | 1.5 in | 7 days | — | None |
| Mar | 2 in | 9 days | — | None |
| Apr | 3.2 in | 9 days | 1.1 in | Moderate |
| May | 3 in | 12 days | 1.3 in | Moderate |
| Jun | 4.2 in | 9 days | 0.1 in | Low |
| Jul | 3.7 in | 9 days | 0.6 in | Moderate |
| Aug | 2.7 in | 8 days | 1.6 in | High |
| Sep | 2.3 in | 7 days | 2 in | High |
| Oct | 2.5 in | 8 days | 1.8 in | High |
| Nov | 2.1 in | 7 days | — | None |
| Dec | 1.8 in | 7 days | — | None |
Annual total: 30.4 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.
Lyon County Soil Profile
Soil Type
Silt Loam
Soil pH
6.3-6.8
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 16 | Oct 13 | 150 days |
| Cautious | May 11 | Oct 6 | 148 days |
| Average year | May 2 | Oct 2 | 153 days |
| Optimistic | Apr 27 | Sep 25 | 151 days |
| Aggressive (risky) | Apr 21 | Sep 19 | 151 days |
Not very — frost dates can vary by ±24 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 (0.6 days/decade). Stay conservative with planting dates.
Gardening Difficulty Score
Lyon County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Lyon 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 Lyon County's climate and soil.
County Extension Office
Lyon County Iowa State University Extension Extension Office
Phone: 515-294-6675
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 Lyon County
Finding local nurseries & garden centers in Lyon County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Lyon 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 Lyon County IA" or "garden center Lyon 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 Lyon County IA" or check your extension office and local parks department. Facebook groups like "Lyon County Gardeners" or "Iowa 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 Lyon County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
The practical takeaway: Day length triggers flowering in many crops. Some need short days (sweet potatoes), some long (most flowers), and some are day-neutral (most modern tomatoes). Lyon County's latitude determines which varieties fit your beds.
Longest Day
15.2 hours
Summer solstice daylight
Shortest Day
8.8 hours
Winter solstice daylight
Peak Sun Hours
10 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.1 hr | 3.8 hr | Short day |
| February | 10.3 hr | 4.4 hr | Short day |
| March | 11.6 hr | 5.8 hr | Short day |
| April | 13.2 hr | 6.9 hr | Neutral |
| May | 14.5 hr | 8.4 hr | Long day |
| June | 15.2 hr | 9.5 hr | Long day |
| July | 14.9 hr | 10 hr | Long day |
| August | 13.8 hr | 8.3 hr | Neutral |
| September | 12.3 hr | 6.8 hr | Neutral |
| October | 10.8 hr | 5.8 hr | Short day |
| November | 9.4 hr | 3.9 hr | Short day |
| December | 8.8 hr | 3.3 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Lyon 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. Lyon 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
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 | 16°F | 23°F | ❄️ Dormant | ~36 weeks |
| Feb | 18°F | 23°F | ❄️ Dormant | ~36 weeks |
| Mar | 26°F | 29°F | ❄️ Dormant | ~36 weeks |
| Apr | 43°F | 39°F | 🐢 Slow | ~24 weeks |
| May | 53°F | 52°F | ♻️ Active | ~14 weeks |
| Jun | 67°F | 59°F | 🔥 Peak | ~8 weeks |
| Jul | 74°F | 67°F | 🔥 Peak | ~8 weeks |
| Aug | 72°F | 68°F | 🔥 Peak | ~8 weeks |
| Sep | 64°F | 64°F | ♻️ Active | ~14 weeks |
| Oct | 54°F | 56°F | ♻️ Active | ~14 weeks |
| Nov | 38°F | 42°F | ❄️ Dormant | ~36 weeks |
| Dec | 24°F | 31°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 Lyon County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
For new gardeners: Pest pressure is a function of climate, not effort. Lyon 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 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 | Low | Jun, Jul |
| Flea beetles | Moderate | May, Jun, Jul |
| Slugs | Moderate | 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 Lyon County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Quick context: Bare soil is wasted soil — it loses nutrients to rain, dries out, compacts, and gets taken over by weeds. Cover crops (clovers, ryegrass, vetch, peas) are the "between seasons" trick that makes soil better every year. In Lyon County, you can fit a cover crop into the gaps.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 14 | Aug 7 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 1 | Jul 31 | ✓ 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 19 | Sep 11 | — | 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 20 | Apr 18 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 10 | Apr 11 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 24 | Apr 11 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 3 | Apr 11 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 5 | Apr 11 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Lyon County
For new gardeners: Wind is the silent water thief. Every breeze pulls moisture from leaves and soil. Lyon County's 8.5 mph average is one piece of the watering math: rainfall + irrigation must exceed evaporation + transpiration, and wind boosts both losses.
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: 11 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
7/10
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 (217 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Lyon County
How much water you can collect, when to collect it, and what size system you need for your garden.
Quick context: A gravity-fed rain barrel ($75) is the easy entry. A larger cistern ($500-1500) covers a whole growing season. Lyon County's 30" annual rainfall determines whether the larger system is overkill or essential.
Annual Collection
15,151 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 30.4 inches of rain per year
- A 1,000 sq ft roof can collect roughly 15,151 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 Lyon County
Soil Type
Silt Loam
Soil pH 6.3–6.8 · 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
153-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 Lyon County
105 vegetables that grow well in Zone 5a with planting dates for Lyon County.
Show all 105 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 28 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Amaranth | Mar 7 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Arugula | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Aug 8 | 30–50 |
| Asparagus | — | — | May 16 | — | — | 730–1095 |
| Beets | — | Apr 18 | — | Jul 24 | Jun 13 – Jul 11 | 50–70 |
| Belgian Endive | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 22 – Oct 17 | 110–150 |
| Bitter Melon | Mar 7 | May 9 | May 16 | — | Jul 18 – Aug 29 | 60–90 |
| Black Beans | — | May 9 | — | — | Aug 8 – Sep 26 | 90–120 |
| Bok Choy | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 18 | 40–60 |
| Broccoli | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 4 – Aug 15 | 60–90 |
| Broccoli Rabe | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 18 | 40–60 |
| Brussels Sprouts | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 1 – Sep 26 | 90–130 |
| Butternut Squash | Mar 28 | May 9 | May 16 | — | Aug 15 – Sep 19 | 85–110 |
| Cabbage | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 4 – Aug 29 | 60–100 |
| Calabash | Mar 7 | May 9 | May 16 | — | Aug 8 – Oct 3 | 80–120 |
| Carrots | — | Apr 18 | — | Jul 24 | Jun 20 – Jul 25 | 60–80 |
| Cauliflower | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 29 | 55–100 |
| Celeriac | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 15 – Sep 19 | 100–120 |
| Celery | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 25 – Sep 19 | 80–120 |
| Celtuce | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 4 – Aug 15 | 60–90 |
| Chard | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 15 | 50–60 |
| Chickpeas | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 25 – Sep 5 | 80–110 |
| Chicory | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 4 – Aug 15 | 60–85 |
| Chinese Cabbage | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Jul 25 | 50–70 |
| Christmas Lima Beans | Mar 7 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Collard Greens | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 29 | 55–75 |
| Corn | — | May 9 | — | — | Jul 11 – Sep 5 | 60–100 |
| Cowpeas | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Cress | Mar 28 | Apr 18 | May 2 | Jul 24 | May 16 – Jun 6 | 14–21 |
| Crookneck Squash | Mar 28 | May 9 | May 16 | — | Jul 4 – Aug 1 | 45–60 |
| Crosne | — | Apr 18 | — | Jul 24 | Sep 19 – Oct 3 | 150–200 |
| Cucumber | Mar 28 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–70 |
| Daikon | — | Apr 18 | — | Jul 24 | Jun 13 – Jul 11 | 50–70 |
| Delicata Squash | Mar 28 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Edamame | — | May 9 | — | — | Jul 25 – Sep 5 | 75–100 |
| Eggplant | Feb 21 | May 9 | May 16 | — | Jul 25 – Sep 26 | 65–85 |
| Endive | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 20 – Jul 25 | 45–65 |
| Escarole | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Jul 25 | 50–70 |
| Fava Beans | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 18 – Aug 29 | 75–100 |
| Fennel | Mar 7 | May 9 | May 16 | — | Jul 18 – Aug 29 | 60–90 |
| Garlic | — | — | — | Aug 21 | Nov 20 – Feb 5 | 90–240 |
| Green Beans | — | May 9 | — | — | Jul 4 – Aug 29 | 50–65 |
| Horseradish | — | — | May 16 | — | Sep 19 – Oct 31 | 120–180 |
| Hot Peppers | Feb 21 | May 9 | May 16 | — | Jul 25 – Oct 31 | 70–120 |
| Hubbard Squash | Mar 28 | May 9 | May 16 | — | Aug 29 – Oct 3 | 100–120 |
| Kabocha | Mar 28 | May 9 | May 16 | — | Aug 15 – Sep 12 | 85–100 |
| Kai Lan | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 20 – Jul 18 | 45–60 |
| Kale | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 22 | 50–70 |
| Kidney Beans | — | May 9 | — | — | Aug 8 – Sep 12 | 85–110 |
| Kohlrabi | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 20 – Jul 25 | 45–65 |
| Komatsuna | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Jul 11 | 35–50 |
| Leeks | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 1 – Oct 17 | 90–150 |
| Lentils | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 25 – Sep 5 | 80–110 |
| Lettuce | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Aug 15 | 30–60 |
| Lima Beans | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Mache | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 18 | 40–60 |
| Melon | Mar 28 | May 9 | May 16 | — | Jul 25 – Sep 12 | 70–100 |
| Microgreens | Mar 28 | Apr 18 | May 2 | Jul 24 | May 9 – Jun 6 | 7–21 |
| Mitsuba | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 20 – Aug 15 | 50–70 |
| Mizuna | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Jul 4 | 30–45 |
| Mustard Greens | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Aug 8 | 30–50 |
| Napa Cabbage | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 1 | 55–75 |
| New Zealand Spinach | Mar 7 | May 9 | May 16 | — | Jul 11 – Aug 8 | 55–70 |
| Okra | Mar 7 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–65 |
| Onion | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 1 – Sep 19 | 90–120 |
| Pac Choi | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 11 | 40–55 |
| Parsnip | — | Apr 18 | — | Jul 24 | Aug 1 – Sep 12 | 100–130 |
| Patty Pan Squash | Mar 28 | May 9 | May 16 | — | Jul 4 – Aug 1 | 45–60 |
| Peas | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 22 | 55–70 |
| Peppers | Feb 21 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–90 |
| Pole Beans | Mar 7 | May 9 | May 16 | — | Jul 11 – Sep 5 | 55–70 |
| Potatoes | Mar 7 | May 9 | May 16 | — | Jul 25 – Oct 3 | 70–120 |
| Pumpkin | Mar 28 | May 9 | May 16 | — | Aug 15 – Oct 3 | 85–120 |
| Purslane | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 18 | 40–60 |
| Radicchio | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 4 – Aug 8 | 60–80 |
| Radish | — | Apr 18 | — | Jul 24 | May 16 – Jun 6 | 22–35 |
| Rhubarb | — | — | May 23 | — | — | 365–730 |
| Romanesco | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 18 – Aug 29 | 75–100 |
| Rutabaga | — | Apr 18 | — | Jul 24 | Jul 11 – Aug 15 | 80–100 |
| Salsify | — | Apr 18 | — | Jul 24 | Aug 1 – Sep 12 | 100–130 |
| Savoy Cabbage | Mar 28 | Apr 18 | May 2 | Jul 24 | Jul 11 – Sep 5 | 70–110 |
| Scallions | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Jul 25 | 50–70 |
| Scarlet Runner Beans | Mar 7 | May 9 | May 16 | — | Jul 18 – Aug 22 | 60–80 |
| Shallot | Mar 28 | Apr 18 | May 2 | Jul 24 | Aug 1 – Sep 19 | 90–120 |
| Shiso | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–70 |
| Snap Peas | Mar 7 | May 9 | May 16 | — | Jul 11 – Sep 5 | 55–70 |
| Snow Peas | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 27 – Aug 22 | 50–65 |
| Soybeans | — | May 9 | — | — | Aug 1 – Sep 26 | 80–120 |
| Spaghetti Squash | Mar 28 | May 9 | May 16 | — | Aug 15 – Sep 12 | 85–100 |
| Spinach | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Aug 8 | 35–50 |
| Squash (Summer) | Mar 28 | May 9 | May 16 | — | Jul 4 – Sep 5 | 45–65 |
| Squash (Winter) | Mar 28 | May 9 | May 16 | — | Aug 8 – Oct 3 | 80–120 |
| Sunchoke | — | — | May 16 | — | Sep 5 – Oct 31 | 110–150 |
| Sweet Corn | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Sweet Potatoes | Mar 7 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Tatsoi | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 6 – Jul 11 | 35–50 |
| Tomatillo | Mar 7 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–85 |
| Tomatoes | Mar 7 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–85 |
| Turnip | — | Apr 18 | — | Jul 24 | May 30 – Jul 4 | 40–60 |
| Watercress | Mar 28 | Apr 18 | May 2 | Jul 24 | Jun 13 – Jul 18 | 40–60 |
| Watermelon | Mar 28 | May 9 | May 16 | — | Jul 25 – Sep 12 | 70–100 |
| Wax Beans | — | May 9 | — | — | Jul 4 – Aug 29 | 50–65 |
| Winter Melon | Mar 7 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Yard Long Beans | Mar 7 | May 9 | May 16 | — | Jul 11 – Aug 22 | 55–80 |
| Zucchini | Mar 28 | May 9 | May 16 | — | Jul 4 – Aug 29 | 45–60 |
🍓 Fruits to Grow in Lyon County
27 fruits that grow well in Zone 5a with planting dates for Lyon County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 23 | — | Aug 22 – Nov 7 | 90–180 |
| Aronia | — | — | May 23 | — | — | 730–1095 |
| Blackberries | — | — | May 23 | — | — | 365–730 |
| Blueberries | — | — | May 23 | — | — | 730–1095 |
| Boysenberries | — | — | May 23 | — | — | 365–730 |
| Cantaloupe | — | — | May 23 | — | Aug 1 – Sep 5 | 70–90 |
| Che Fruit | — | — | May 23 | — | — | 1095–1825 |
| Cranberries | — | — | May 23 | — | — | 730–1095 |
| Currants | — | — | May 23 | — | — | 730–1095 |
| Elderberries | — | — | May 23 | — | — | 730–1095 |
| Goji Berries | — | — | May 23 | — | — | 730–1095 |
| Gooseberries | — | — | May 23 | — | — | 730–1095 |
| Grapes | — | — | May 23 | — | — | 730–1095 |
| Ground Cherry | — | — | May 23 | — | Aug 1 – Sep 26 | 65–80 |
| Hardy Kiwi | — | — | May 23 | — | — | 1095–1825 |
| Haskaps | — | — | May 23 | — | — | 730–1095 |
| Honeydew | — | — | May 23 | — | Aug 15 – Sep 26 | 80–110 |
| Jostaberry | — | — | May 23 | — | — | 730–1095 |
| Lingonberries | — | — | May 23 | — | — | 730–1095 |
| Medlar | — | — | May 23 | — | — | 1095–1825 |
| Mulberries | — | — | May 23 | — | — | 730–1825 |
| Pawpaw | — | — | May 23 | — | — | 1095–2555 |
| Persimmon | — | — | May 23 | — | — | 1095–2555 |
| Quince | — | — | May 23 | — | — | 1095–1825 |
| Raspberries | — | — | May 23 | — | — | 365–730 |
| Serviceberries | — | — | May 23 | — | — | 730–1095 |
| Strawberries | — | — | May 23 | — | Aug 22 – Nov 7 | 90–365 |
🌿 Herbs to Grow in Lyon County
34 herbs that grow well in Zone 5a with planting dates for Lyon County.
Show all 34 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 28 | Apr 18 | Apr 25 | Jul 24 | — | 365–730 |
| Anise | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jul 25 – Oct 10 | 90–120 |
| Basil | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 12 | 50–75 |
| Bee Balm | — | — | May 9 | — | Aug 8 – Oct 24 | 90–120 |
| Borage | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 20 – Aug 8 | 50–60 |
| Caraway | Mar 28 | Apr 18 | Apr 25 | Jul 24 | — | 365–450 |
| Catnip | — | — | May 9 | — | Jul 11 – Sep 12 | 60–80 |
| Chamomile | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 27 – Sep 5 | 60–90 |
| Chervil | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 6 – Aug 8 | 40–60 |
| Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cilantro | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 6 – Aug 8 | 40–60 |
| Comfrey | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cumin | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Aug 8 – Oct 10 | 100–120 |
| Dill | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 6 – Aug 8 | 40–60 |
| Epazote | Mar 14 | May 9 | May 16 | — | Jul 4 – Aug 29 | 45–60 |
| Fennel (herb) | Mar 28 | Apr 18 | Apr 25 | Jul 24 | Jun 27 – Sep 5 | 60–90 |
| Feverfew | — | — | May 9 | — | Aug 8 – Oct 24 | 90–120 |
| 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 |
| Lemon Thyme | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| 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 28 | Apr 18 | Apr 25 | Jul 24 | 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 28 | Apr 18 | Apr 25 | Jul 24 | Jun 6 – Aug 8 | 40–60 |
| Tarragon | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Thai Basil | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 12 | 50–75 |
| Thyme | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Valerian | — | — | May 9 | — | Sep 12 – Oct 24 | 120–180 |
🌸 Flowers to Grow in Lyon County
51 flowers that grow well in Zone 5a with planting dates for Lyon County.
Show all 51 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 14 | May 9 | May 9 | — | Jul 4 – Sep 26 | 60–75 |
| Alliums | — | — | — | Aug 21 | Sep 25 – Oct 23 | 28–42 |
| Anemones | Apr 4 | — | May 2 | — | Jun 13 – Jul 11 | 90–120 |
| Astilbe | Feb 28 | — | May 16 | — | Aug 1 – Oct 3 | 70–100 |
| Bachelor's Button | Mar 21 | Apr 11 | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Begonias | Feb 21 | — | May 9 | — | Jul 18 – Oct 10 | 70–90 |
| Black-eyed Susan | Feb 28 | May 2 | May 16 | — | Aug 1 – Oct 31 | 60–80 |
| Bleeding Hearts | Feb 28 | — | May 16 | — | Jul 11 – Aug 22 | 60–90 |
| Calendula | Mar 21 | Apr 11 | May 2 | — | Jun 20 – Sep 12 | 50–70 |
| Celosia | Mar 28 | May 16 | May 16 | — | Jul 18 – Oct 17 | 60–90 |
| Columbine | Feb 28 | May 16 | May 16 | — | Jul 11 – Aug 22 | 70–100 |
| Coreopsis | Feb 28 | May 9 | May 16 | — | Jul 25 – Oct 31 | 60–80 |
| Cosmos | Apr 4 | May 9 | May 9 | — | Jul 18 – Oct 10 | 60–90 |
| Crocus | — | — | — | Aug 21 | Jul 3 – Jul 24 | 10–20 |
| Daffodils | — | — | — | Aug 21 | Jul 10 – Jul 31 | 20–40 |
| Dahlias | Apr 4 | May 9 | May 9 | — | Aug 1 – Oct 24 | 70–120 |
| Daylily | Feb 28 | — | May 16 | — | Aug 8 – Oct 31 | 60–90 |
| Dianthus | Feb 28 | Apr 4 | Apr 18 | — | Jun 6 – Aug 22 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 28 | May 16 | May 16 | — | Aug 8 – Oct 31 | 70–90 |
| Foxglove | Feb 28 | May 16 | May 16 | — | Jul 11 – Aug 22 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 7 | May 16 | May 16 | — | Jul 25 – Nov 14 | 70–100 |
| Geraniums | Feb 21 | — | May 9 | — | Jul 18 – Oct 10 | 70–100 |
| Gladiolus | — | May 9 | May 9 | — | Aug 1 – Oct 24 | 70–100 |
| Hostas | Feb 21 | — | May 16 | — | Aug 8 – Oct 31 | 60–90 |
| Hyacinths | — | — | — | Aug 21 | Jul 31 – Aug 28 | 14–28 |
| Hydrangeas | Feb 21 | — | May 16 | — | Aug 1 – Oct 17 | 90–150 |
| Impatiens | Mar 7 | — | May 9 | — | Jul 18 – Oct 10 | 60–75 |
| Irises | — | Division | May 16 | — | Jul 11 – Aug 15 | 60–100 |
| Larkspur | — | Apr 4 | — | — | Jun 13 – Aug 8 | 60–90 |
| Lavender | Feb 21 | — | May 23 | — | Aug 1 – Sep 12 | 90–120 |
| Lilies | — | Division | May 16 | — | Jul 25 – Oct 17 | 70–120 |
| Lobelia | Feb 21 | — | Apr 25 | — | Jun 20 – Aug 29 | 70–80 |
| Lupine | Feb 28 | May 16 | May 16 | — | Jul 11 – Aug 22 | 75–100 |
| Marigolds | Mar 21 | May 9 | May 9 | — | Jul 4 – Sep 26 | 50–70 |
| Nasturtium | Apr 4 | May 9 | May 9 | — | Jul 4 – Oct 10 | 55–65 |
| Pansy | Feb 21 | — | May 2 | — | Jun 27 – Aug 22 | 70–90 |
| Peonies | — | Division | May 16 | — | Jul 25 – Sep 5 | 90–120 |
| Petunia | Mar 7 | — | May 9 | — | Jul 18 – Oct 10 | 70–90 |
| Phlox | Feb 28 | May 16 | May 16 | — | Aug 1 – Oct 17 | 80–110 |
| Portulaca | Mar 28 | May 16 | May 16 | — | Jul 4 – Oct 3 | 50–70 |
| Roses | Feb 21 | — | May 16 | — | Aug 1 – Oct 31 | 90–180 |
| Salvia | Feb 28 | — | May 9 | — | Jul 18 – Oct 10 | 70–90 |
| Sedum (Stonecrop) | Feb 28 | — | May 16 | — | Sep 12 – Nov 14 | 60–90 |
| Snapdragon | Feb 21 | Apr 18 | May 2 | — | Jul 11 – Sep 12 | 70–100 |
| Sunflower | Apr 11 | May 9 | May 9 | — | Aug 1 – Oct 10 | 70–100 |
| Sweet Alyssum | Mar 14 | Apr 18 | May 2 | — | Jun 13 – Aug 22 | 45–60 |
| Sweet Pea | Mar 21 | Mar 28 | May 2 | — | Jul 18 – Sep 19 | 65–85 |
| Tulips | — | — | — | Aug 21 | Jul 24 – Aug 14 | 15–30 |
| Vinca (Annual) | Feb 14 | — | May 16 | — | Jul 25 – Oct 10 | 70–90 |
| Yarrow | Feb 28 | May 2 | May 16 | — | Jul 25 – Oct 31 | 60–90 |
| Zinnia | Apr 4 | May 9 | May 9 | — | Jul 18 – Oct 10 | 60–70 |
Monthly Planting Guide for Lyon County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Lyon County.
Frequently Asked Questions
What planting zone is Lyon County, IA?
Lyon County is in USDA Hardiness Zone 5a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in Lyon County, IA?
Based on 31 years of NOAA weather station data, the median last spring frost in Lyon County falls around May 2. In 8 out of 10 years, last frost lands between April 21 and May 16 — a 24-day window of variability. Use May 16 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Lyon County, IA?
The median first fall frost in Lyon County arrives around October 2. In cold years it can arrive as early as September 19; in mild years as late as October 13. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Lyon County?
Lyon County has a frost-free growing season of approximately 153 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing. Climate records show the growing season is trending shorter by about 0.57 days per decade.
What is the soil like in Lyon County for gardening?
Lyon County has predominantly Silt Loam soil with a pH range of 6.3–6.8 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Lyon County?
Lyon County has commercial agriculture that includes Corn, Soybeans, Hay, Wheat, Hogs. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Lyon County a good location for home gardening?
Lyon County scores 72/100 (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 Lyon County Garden Planner — Free
A 22-page printable planner built for Lyon County (Zone 5a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log