Silvis, IL — Planting Guide for June
Free PDF, personalized for your town's frost dates & climate. Drop your email — we'll send the link.
June to-do list for Rock Island County, Illinois
Your garden in Rock Island County, Illinois is working on a schedule, even when you're not. Here's where you should be this June.
-
Begin indoor sowing: basil, peppers, and pole beans
You're about 17 weeks out from your last frost — the perfect window to get these germinating indoors.
-
Collect basil, carrots, and cucumber at their peak
If you can't use it all right away, check the food-preservation section of your planner.
Get ahead of July
- Starting indoors: vinca (annual)
- First harvests: basil, carrots, and cucumber
Silvis gardens in a maritime climate — mild wet winters, cool dry summers (38" annual rainfall, most of it October to April). Cool-season crops like peas, lettuce, kale, and brassicas thrive almost year-round. The challenge is summer heat: long-season warm-weather crops (full-size tomatoes, peppers, melons) need every bit of summer sun, so prioritize short-season varieties, use dark mulches to warm the soil, and reserve your warmest microclimates (south-facing walls, near pavement) for the tender stuff.
Soils trend Silt Loam — the gold standard for vegetables. Add 2–3" of compost annually to maintain it and you'll outgrow most of your neighbors.
Drought pressure is moderate (15.5 weeks/year on average). Mulching and drip irrigation pay for themselves quickly.
🌡️ USDA Zone
5b (-15°F to -10°F min)
❄️ Avg. Last Frost
April 15
🍂 Avg. First Frost
October 19
📅 Growing Season
187 days
🌧️ Climate
Moderate 37.8" annual
💨 Wind
Moderate 9.1 mph avg
🥶 Frost Tier
Regular 0% frost-free years
🏜️ Drought
15.5 wk/yr trend stable
📍 ZIP Codes
1 ZIP
Monthly Watering Calendar for Silvis
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
Quick context: Over-watering kills more plants than under-watering. Silvis's 38" annual rainfall changes the gardening playbook — humid-region gardeners often water by the calendar when they should water by the soil moisture.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.7 in | 7 days | — | None |
| Feb | 1.4 in | 7 days | — | None |
| Mar | 2.2 in | 8 days | — | None |
| Apr | 3.6 in | 9 days | 0.7 in | Moderate |
| May | 4.2 in | 11 days | 0.1 in | Low |
| Jun | 4.7 in | 11 days | — | Low |
| Jul | 3.5 in | 9 days | 0.8 in | Moderate |
| Aug | 4.2 in | 8 days | 0.1 in | Low |
| Sep | 2.7 in | 7 days | 1.6 in | High |
| Oct | 2.8 in | 8 days | 1.5 in | Moderate |
| Nov | 2.6 in | 7 days | — | None |
| Dec | 2.2 in | 8 days | — | None |
Annual total: 35.8 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.
Silvis Soil Profile
Soil Type
Silt Loam
Soil pH
6.3-6.9
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 3 | Nov 4 | 185 days |
| Cautious | Apr 24 | Oct 25 | 184 days |
| Average year | Apr 15 | Oct 19 | 187 days |
| Optimistic | Apr 10 | Oct 11 | 184 days |
| Aggressive (risky) | Apr 4 | Oct 5 | 184 days |
Not very — frost dates can vary by ±29 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting shorter here (about 3 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Rock Island County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in Rock Island County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Rock Island County's climate and soil.
County Extension Office
Rock Island County University of Illinois Extension Extension Office
Phone: 217-333-7672
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Rock Island County
Finding local nurseries & garden centers in Rock Island County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Rock Island County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Rock Island County IL" or "garden center Rock Island County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Rock Island County IL" or check your extension office and local parks department. Facebook groups like "Rock Island County Gardeners" or "Illinois 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 Silvis
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why it matters: Onion varieties are sold by "short-day," "intermediate-day," and "long-day." Silvis's latitude determines which to buy — and getting it wrong is the difference between baseball-sized bulbs and marbles.
Longest Day
15 hours
Summer solstice daylight
Shortest Day
9 hours
Winter solstice daylight
Peak Sun Hours
9.7 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 | 9.3 hr | 3.9 hr | Short day |
| February | 10.4 hr | 4.5 hr | Short day |
| March | 11.7 hr | 5.4 hr | Short day |
| April | 13.1 hr | 6.9 hr | Neutral |
| May | 14.3 hr | 8 hr | Long day |
| June | 15 hr | 9.1 hr | Long day |
| July | 14.7 hr | 9.7 hr | Long day |
| August | 13.7 hr | 8.4 hr | Neutral |
| September | 12.3 hr | 7.2 hr | Neutral |
| October | 10.9 hr | 5.8 hr | Short day |
| November | 9.6 hr | 3.9 hr | Short day |
| December | 9 hr | 3.6 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Silvis
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
For new gardeners: Lettuce germinates at 35°F. Beans want 60°F. Tomatoes 65°F+. Soil temp, not air temp, is what plants feel. Silvis's monthly curve tells you when each crop actually has the conditions to take off.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jun through Sep.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 24°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 22°F | 30°F | ❄️ Dormant | ~36 weeks |
| Mar | 30°F | 34°F | ❄️ Dormant | ~36 weeks |
| Apr | 45°F | 43°F | 🐢 Slow | ~24 weeks |
| May | 58°F | 55°F | ♻️ Active | ~14 weeks |
| Jun | 69°F | 65°F | 🔥 Peak | ~8 weeks |
| Jul | 75°F | 70°F | 🔥 Peak | ~8 weeks |
| Aug | 79°F | 72°F | 🔥 Peak | ~8 weeks |
| Sep | 68°F | 69°F | 🔥 Peak | ~8 weeks |
| Oct | 57°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 43°F | 48°F | 🐢 Slow | ~24 weeks |
| Dec | 31°F | 39°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 Silvis
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Why it matters: Pest pressure scales with warmth and humidity. Hot humid Silvis 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 |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Moderate | May, Jun, Jul, Aug |
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 Silvis
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Why it matters: A fall-planted cover crop in Silvis is the closest thing to free soil amendment. Plant cereal rye or hairy vetch after harvest; chop it down before it flowers in spring; the soil it leaves behind out-grows any store-bought compost.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Apr 22 | Aug 24 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Apr 25 | Aug 10 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 18 | Aug 17 | ✓ 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 1 | Sep 28 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 10 | Mar 25 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Sep 2 | Apr 1 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 5 | Apr 1 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 9 | Mar 25 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 19 | Apr 1 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 19 | Apr 1 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Silvis
For new gardeners: Light wind is good (strengthens stems, aids pollination); strong wind is bad (snaps stems, dries leaves, scatters seeds). Silvis averages 9.1 mph. If you garden near coast, ridge, or open plains, you're likely above that — plan for it.
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: 9 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.7/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (131 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Silvis
How much water you can collect, when to collect it, and what size system you need for your garden.
The practical takeaway: The first inch of rain washes the roof clean — a first-flush diverter sends it to waste before the barrel fills. Worth the extra $20 for cleaner garden water. Silvis gets 38" annually, so you'll fill and flush many times per year.
Annual Collection
17,842 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
Apr, May, Jun, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 35.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 17,842 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
🥬 Vegetables to Grow in Silvis
105 vegetables matched to Zone 5b with planting dates calibrated for Silvis.
Show all 105 vegetables with dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 11 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Amaranth | Feb 18 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Arugula | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jul 22 | 30–50 |
| Asparagus | — | — | Apr 29 | — | — | 730–1095 |
| Beets | — | Apr 1 | — | Aug 10 | May 27 – Jun 24 | 50–70 |
| Belgian Endive | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Aug 5 – Sep 30 | 110–150 |
| Bitter Melon | Feb 18 | Apr 22 | Apr 29 | — | Jul 1 – Aug 12 | 60–90 |
| Black Beans | — | Apr 22 | — | — | Jul 22 – Sep 9 | 90–120 |
| Bok Choy | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jul 1 | 40–60 |
| Broccoli | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 17 – Jul 29 | 60–90 |
| Broccoli Rabe | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jul 1 | 40–60 |
| Brussels Sprouts | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 15 – Sep 9 | 90–130 |
| Butternut Squash | Mar 11 | Apr 22 | Apr 29 | — | Jul 29 – Sep 2 | 85–110 |
| Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 17 – Aug 12 | 60–100 |
| Calabash | Feb 18 | Apr 22 | Apr 29 | — | Jul 22 – Sep 16 | 80–120 |
| Carrots | — | Apr 1 | — | Aug 10 | Jun 3 – Jul 8 | 60–80 |
| Cauliflower | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Aug 12 | 55–100 |
| Celeriac | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 29 – Sep 2 | 100–120 |
| Celery | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 8 – Sep 2 | 80–120 |
| Celtuce | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 17 – Jul 29 | 60–90 |
| Chard | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Jul 29 | 50–60 |
| Chickpeas | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 8 – Aug 19 | 80–110 |
| Chicory | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 17 – Jul 29 | 60–85 |
| Chinese Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Jul 8 | 50–70 |
| Christmas Lima Beans | Feb 18 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Collard Greens | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Aug 12 | 55–75 |
| Corn | — | Apr 22 | — | — | Jun 24 – Aug 19 | 60–100 |
| Cowpeas | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Cress | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Apr 29 – May 20 | 14–21 |
| Crookneck Squash | Mar 11 | Apr 22 | Apr 29 | — | Jun 17 – Jul 15 | 45–60 |
| Crosne | — | Apr 1 | — | Aug 10 | Sep 2 – Sep 16 | 150–200 |
| Cucumber | Mar 11 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–70 |
| Daikon | — | Apr 1 | — | Aug 10 | May 27 – Jun 24 | 50–70 |
| Delicata Squash | Mar 11 | Apr 22 | Apr 29 | — | Jul 22 – Aug 26 | 80–100 |
| Edamame | — | Apr 22 | — | — | Jul 8 – Aug 19 | 75–100 |
| Eggplant | Feb 4 | Apr 22 | Apr 29 | — | Jul 8 – Sep 9 | 65–85 |
| Endive | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 3 – Jul 8 | 45–65 |
| Escarole | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Jul 8 | 50–70 |
| Fava Beans | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 1 – Aug 12 | 75–100 |
| Fennel | Feb 18 | Apr 22 | Apr 29 | — | Jul 1 – Aug 12 | 60–90 |
| Garlic | — | — | — | Sep 7 | Dec 7 – Feb 22 | 90–240 |
| Green Beans | — | Apr 22 | — | — | Jun 17 – Aug 12 | 50–65 |
| Horseradish | — | — | Apr 29 | — | Sep 2 – Oct 14 | 120–180 |
| Hot Peppers | Feb 4 | Apr 22 | Apr 29 | — | Jul 8 – Oct 14 | 70–120 |
| Hubbard Squash | Mar 11 | Apr 22 | Apr 29 | — | Aug 12 – Sep 16 | 100–120 |
| Kabocha | Mar 11 | Apr 22 | Apr 29 | — | Jul 29 – Aug 26 | 85–100 |
| Kai Lan | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 3 – Jul 1 | 45–60 |
| Kale | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Aug 5 | 50–70 |
| Kidney Beans | — | Apr 22 | — | — | Jul 22 – Aug 26 | 85–110 |
| Kohlrabi | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 3 – Jul 8 | 45–65 |
| Komatsuna | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jun 24 | 35–50 |
| Leeks | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 15 – Sep 30 | 90–150 |
| Lentils | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 8 – Aug 19 | 80–110 |
| Lettuce | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jul 29 | 30–60 |
| Lima Beans | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Mache | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jul 1 | 40–60 |
| Melon | Mar 11 | Apr 22 | Apr 29 | — | Jul 8 – Aug 26 | 70–100 |
| Microgreens | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Apr 22 – May 20 | 7–21 |
| Mitsuba | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jun 3 – Jul 29 | 50–70 |
| Mizuna | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jun 17 | 30–45 |
| Mustard Greens | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jul 22 | 30–50 |
| Napa Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Jul 15 | 55–75 |
| New Zealand Spinach | Feb 18 | Apr 22 | Apr 29 | — | Jun 24 – Jul 22 | 55–70 |
| Okra | Feb 18 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–65 |
| Onion | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 15 – Sep 2 | 90–120 |
| Pac Choi | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jun 24 | 40–55 |
| Parsnip | — | Apr 1 | — | Aug 10 | Jul 15 – Aug 26 | 100–130 |
| Patty Pan Squash | Mar 11 | Apr 22 | Apr 29 | — | Jun 17 – Jul 15 | 45–60 |
| Peas | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Aug 5 | 55–70 |
| Peppers | Feb 4 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–90 |
| Pole Beans | Feb 18 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 55–70 |
| Potatoes | Feb 18 | Apr 22 | Apr 29 | — | Jul 8 – Sep 16 | 70–120 |
| Pumpkin | Mar 11 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 85–120 |
| Purslane | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jul 1 | 40–60 |
| Radicchio | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 17 – Jul 22 | 60–80 |
| Radish | — | Apr 1 | — | Aug 10 | Apr 29 – May 20 | 22–35 |
| Rhubarb | — | — | May 6 | — | — | 365–730 |
| Romanesco | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 1 – Aug 12 | 75–100 |
| Rutabaga | — | Apr 1 | — | Aug 10 | Jun 24 – Jul 29 | 80–100 |
| Salsify | — | Apr 1 | — | Aug 10 | Jul 15 – Aug 26 | 100–130 |
| Savoy Cabbage | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 24 – Aug 19 | 70–110 |
| Scallions | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Jul 8 | 50–70 |
| Scarlet Runner Beans | Feb 18 | Apr 22 | Apr 29 | — | Jul 1 – Aug 5 | 60–80 |
| Shallot | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jul 15 – Sep 2 | 90–120 |
| Shiso | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 50–70 |
| Snap Peas | Feb 18 | Apr 22 | Apr 29 | — | Jun 24 – Aug 19 | 55–70 |
| Snow Peas | Mar 11 | Apr 1 | Apr 15 | Aug 10 | Jun 10 – Aug 5 | 50–65 |
| Soybeans | — | Apr 22 | — | — | Jul 15 – Sep 9 | 80–120 |
| Spaghetti Squash | Mar 11 | Apr 22 | Apr 29 | — | Jul 29 – Aug 26 | 85–100 |
| Spinach | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jul 22 | 35–50 |
| Squash (Summer) | Mar 11 | Apr 22 | Apr 29 | — | Jun 17 – Aug 19 | 45–65 |
| Squash (Winter) | Mar 11 | Apr 22 | Apr 29 | — | Jul 22 – Sep 16 | 80–120 |
| Sunchoke | — | — | Apr 29 | — | Aug 19 – Oct 14 | 110–150 |
| Sweet Corn | — | Apr 22 | — | — | Jun 24 – Aug 5 | 60–90 |
| Sweet Potatoes | Feb 18 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Tatsoi | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 20 – Jun 24 | 35–50 |
| Tomatillo | Feb 18 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–85 |
| Tomatoes | Feb 18 | Apr 22 | Apr 29 | — | Jul 1 – Sep 9 | 60–85 |
| Turnip | — | Apr 1 | — | Aug 10 | May 13 – Jun 17 | 40–60 |
| Watercress | Mar 11 | Apr 1 | Apr 15 | Aug 10 | May 27 – Jul 1 | 40–60 |
| Watermelon | Mar 11 | Apr 22 | Apr 29 | — | Jul 8 – Aug 26 | 70–100 |
| Wax Beans | — | Apr 22 | — | — | Jun 17 – Aug 12 | 50–65 |
| Winter Melon | Feb 18 | Apr 22 | Apr 29 | — | Jul 29 – Sep 16 | 90–120 |
| Yard Long Beans | Feb 18 | Apr 22 | Apr 29 | — | Jun 24 – Aug 5 | 55–80 |
| Zucchini | Mar 11 | Apr 22 | Apr 29 | — | Jun 17 – Aug 12 | 45–60 |
🍓 Fruits to Grow in Silvis
27 fruits matched to Zone 5b with planting dates calibrated for Silvis.
Show all 27 fruits with dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 6 | — | Aug 5 – Oct 21 | 90–180 |
| Aronia | — | — | May 6 | — | — | 730–1095 |
| Blackberries | — | — | May 6 | — | — | 365–730 |
| Blueberries | — | — | May 6 | — | — | 730–1095 |
| Boysenberries | — | — | May 6 | — | — | 365–730 |
| Cantaloupe | — | — | May 6 | — | Jul 15 – Aug 19 | 70–90 |
| Che Fruit | — | — | May 6 | — | — | 1095–1825 |
| Cranberries | — | — | May 6 | — | — | 730–1095 |
| Currants | — | — | May 6 | — | — | 730–1095 |
| Elderberries | — | — | May 6 | — | — | 730–1095 |
| Goji Berries | — | — | May 6 | — | — | 730–1095 |
| Gooseberries | — | — | May 6 | — | — | 730–1095 |
| Grapes | — | — | May 6 | — | — | 730–1095 |
| Ground Cherry | — | — | May 6 | — | Jul 15 – Sep 9 | 65–80 |
| Hardy Kiwi | — | — | May 6 | — | — | 1095–1825 |
| Haskaps | — | — | May 6 | — | — | 730–1095 |
| Honeydew | — | — | May 6 | — | Jul 29 – Sep 9 | 80–110 |
| Jostaberry | — | — | May 6 | — | — | 730–1095 |
| Lingonberries | — | — | May 6 | — | — | 730–1095 |
| Medlar | — | — | May 6 | — | — | 1095–1825 |
| Mulberries | — | — | May 6 | — | — | 730–1825 |
| Pawpaw | — | — | May 6 | — | — | 1095–2555 |
| Persimmon | — | — | May 6 | — | — | 1095–2555 |
| Quince | — | — | May 6 | — | — | 1095–1825 |
| Raspberries | — | — | May 6 | — | — | 365–730 |
| Serviceberries | — | — | May 6 | — | — | 730–1095 |
| Strawberries | — | — | May 6 | — | Aug 5 – Oct 21 | 90–365 |
🌿 Herbs to Grow in Silvis
34 herbs matched to Zone 5b with planting dates calibrated for Silvis.
Show all 34 herbs with dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 11 | Apr 1 | Apr 8 | Aug 10 | — | 365–730 |
| Anise | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jul 8 – Sep 23 | 90–120 |
| Basil | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 26 | 50–75 |
| Bee Balm | — | — | Apr 22 | — | Jul 22 – Oct 7 | 90–120 |
| Borage | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jun 3 – Jul 22 | 50–60 |
| Caraway | Mar 11 | Apr 1 | Apr 8 | Aug 10 | — | 365–450 |
| Catnip | — | — | Apr 22 | — | Jun 24 – Aug 26 | 60–80 |
| Chamomile | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jun 10 – Aug 19 | 60–90 |
| Chervil | Mar 11 | Apr 1 | Apr 8 | Aug 10 | May 20 – Jul 22 | 40–60 |
| Chives | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Cilantro | Mar 11 | Apr 1 | Apr 8 | Aug 10 | May 20 – Jul 22 | 40–60 |
| Comfrey | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Cumin | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jul 22 – Sep 23 | 100–120 |
| Dill | Mar 11 | Apr 1 | Apr 8 | Aug 10 | May 20 – Jul 22 | 40–60 |
| Epazote | Feb 25 | Apr 22 | Apr 29 | — | Jun 17 – Aug 12 | 45–60 |
| Fennel (herb) | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jun 10 – Aug 19 | 60–90 |
| Feverfew | — | — | Apr 22 | — | Jul 22 – Oct 7 | 90–120 |
| Garlic Chives | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Horehound | — | — | Apr 22 | — | Jul 8 – Sep 2 | 75–90 |
| Hyssop | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Lemon Balm | — | — | Apr 22 | — | Jun 24 – Aug 12 | 60–70 |
| Lemon Thyme | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Lovage | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Mint | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Oregano | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Parsley | Mar 11 | Apr 1 | Apr 8 | Aug 10 | Jun 10 – Aug 12 | 60–80 |
| Rue | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Sage | — | — | Apr 22 | — | Jul 8 – Sep 2 | 75–90 |
| Savory | — | — | Apr 22 | — | Jun 17 – Aug 12 | 50–70 |
| Sorrel | Mar 11 | Apr 1 | Apr 8 | Aug 10 | May 20 – Jul 22 | 40–60 |
| Tarragon | — | — | Apr 22 | — | Jun 24 – Sep 2 | 60–90 |
| Thai Basil | Feb 25 | Apr 22 | Apr 29 | — | Jun 24 – Aug 26 | 50–75 |
| Thyme | — | — | Apr 22 | — | Jul 1 – Sep 2 | 70–90 |
| Valerian | — | — | Apr 22 | — | Aug 26 – Oct 7 | 120–180 |
🌸 Flowers to Grow in Silvis
51 flowers matched to Zone 5b with planting dates calibrated for Silvis.
Show all 51 flowers with dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Feb 25 | Apr 22 | Apr 22 | — | Jun 17 – Sep 16 | 60–75 |
| Alliums | — | — | — | Sep 7 | Oct 12 – Nov 2 | 28–42 |
| Anemones | Mar 18 | — | Apr 15 | — | May 20 – Jun 17 | 90–120 |
| Astilbe | Feb 11 | — | Apr 29 | — | Jul 15 – Sep 23 | 70–100 |
| Bachelor's Button | Mar 4 | Mar 25 | Apr 15 | — | Jun 17 – Sep 2 | 60–90 |
| Begonias | Feb 4 | — | Apr 22 | — | Jul 1 – Sep 23 | 70–90 |
| Black-eyed Susan | Feb 11 | Apr 15 | Apr 29 | — | Jul 15 – Oct 21 | 60–80 |
| Bleeding Hearts | Feb 11 | — | Apr 29 | — | Jun 24 – Aug 5 | 60–90 |
| Calendula | Mar 4 | Mar 25 | Apr 15 | — | Jun 3 – Sep 2 | 50–70 |
| Celosia | Mar 11 | Apr 22 | Apr 22 | — | Jun 24 – Sep 30 | 60–90 |
| Columbine | Feb 11 | Apr 29 | Apr 29 | — | Jun 24 – Aug 5 | 70–100 |
| Coreopsis | Feb 11 | Apr 22 | Apr 29 | — | Jul 8 – Oct 21 | 60–80 |
| Cosmos | Mar 18 | Apr 15 | Apr 15 | — | Jun 24 – Sep 23 | 60–90 |
| Crocus | — | — | — | Sep 7 | Jul 20 – Aug 10 | 10–20 |
| Daffodils | — | — | — | Sep 7 | Jul 27 – Aug 17 | 20–40 |
| Dahlias | Mar 18 | Apr 22 | Apr 22 | — | Jul 15 – Oct 14 | 70–120 |
| Daylily | Feb 11 | — | Apr 29 | — | Jul 22 – Oct 21 | 60–90 |
| Dianthus | Feb 11 | Mar 18 | Apr 1 | — | May 20 – Aug 12 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 11 | Apr 29 | Apr 29 | — | Jul 22 – Oct 21 | 70–90 |
| Foxglove | Feb 11 | Apr 29 | Apr 29 | — | Jun 24 – Aug 5 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 18 | Apr 22 | Apr 22 | — | Jul 1 – Oct 21 | 70–100 |
| Geraniums | Feb 4 | — | Apr 22 | — | Jul 1 – Sep 23 | 70–100 |
| Gladiolus | — | Apr 22 | Apr 22 | — | Jul 15 – Oct 14 | 70–100 |
| Hostas | Feb 4 | — | Apr 29 | — | Jul 22 – Oct 21 | 60–90 |
| Hyacinths | — | — | — | Sep 7 | Aug 17 – Sep 14 | 14–28 |
| Hydrangeas | Feb 4 | — | Apr 29 | — | Jul 15 – Oct 7 | 90–150 |
| Impatiens | Feb 18 | — | Apr 22 | — | Jul 1 – Sep 30 | 60–75 |
| Irises | — | Division | Apr 29 | — | Jun 24 – Jul 29 | 60–100 |
| Larkspur | — | Mar 18 | — | — | May 27 – Jul 22 | 60–90 |
| Lavender | Feb 4 | — | May 6 | — | Jul 15 – Sep 2 | 90–120 |
| Lilies | — | Division | Apr 29 | — | Jul 8 – Oct 7 | 70–120 |
| Lobelia | Feb 4 | — | Apr 8 | — | Jun 3 – Aug 19 | 70–80 |
| Lupine | Feb 11 | Apr 29 | Apr 29 | — | Jun 24 – Aug 5 | 75–100 |
| Marigolds | Mar 4 | Apr 22 | Apr 22 | — | Jun 17 – Sep 16 | 50–70 |
| Nasturtium | Mar 18 | Apr 22 | Apr 22 | — | Jun 17 – Sep 30 | 55–65 |
| Pansy | Feb 4 | — | Apr 15 | — | Jun 10 – Aug 12 | 70–90 |
| Peonies | — | Division | Apr 29 | — | Jul 8 – Aug 19 | 90–120 |
| Petunia | Feb 18 | — | Apr 22 | — | Jul 1 – Sep 30 | 70–90 |
| Phlox | Feb 11 | Apr 29 | Apr 29 | — | Jul 15 – Oct 7 | 80–110 |
| Portulaca | Mar 11 | Apr 22 | Apr 22 | — | Jun 10 – Sep 16 | 50–70 |
| Roses | Feb 4 | — | Apr 29 | — | Jul 15 – Oct 21 | 90–180 |
| Salvia | Feb 11 | — | Apr 22 | — | Jul 1 – Sep 30 | 70–90 |
| Sedum (Stonecrop) | Feb 11 | — | Apr 29 | — | Aug 26 – Nov 4 | 60–90 |
| Snapdragon | Feb 4 | Apr 1 | Apr 15 | — | Jun 24 – Sep 2 | 70–100 |
| Sunflower | Mar 25 | Apr 22 | Apr 22 | — | Jul 15 – Sep 30 | 70–100 |
| Sweet Alyssum | Feb 25 | Apr 1 | Apr 15 | — | May 27 – Aug 5 | 45–60 |
| Sweet Pea | Mar 4 | Mar 11 | Apr 15 | — | Jul 1 – Sep 2 | 65–85 |
| Tulips | — | — | — | Sep 7 | Aug 10 – Aug 31 | 15–30 |
| Vinca (Annual) | Jan 28 | — | Apr 22 | — | Jul 1 – Sep 23 | 70–90 |
| Yarrow | Feb 11 | Apr 15 | Apr 29 | — | Jul 8 – Oct 21 | 60–90 |
| Zinnia | Mar 18 | Apr 22 | Apr 22 | — | Jul 1 – Sep 30 | 60–70 |
Monthly Planting Guide for Silvis
ZIP Codes in Silvis
Click any ZIP to see its specific frost, soil, and climate measurements (some ZIPs differ noticeably from the town aggregate):
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Rock Island County.
Your Rock Island County Garden Planner — Free
A 22-page printable planner built for Rock Island County (Zone 5b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log