Sullivan County, IN — Planting Guide
Sullivan County is in USDA Zone 6b. The average last spring frost is April 18 and the first fall frost is October 17, giving you a growing season of approximately 182 days.
At an elevation of 914 ft, Sullivan County receives approximately 34.6 in of rainfall annually. Summer highs average 90°F with winter lows around 26°F. The predominant soil type is Silt Loam.
🌡️ Zone
6b (-5°F to 0°F min)
❄️ Last Frost
April 18
🍂 First Frost
October 17
📅 Growing Season
182 days
⛰️ Elevation
914 ft
🌧️ Annual Rainfall
34.6 in
Sullivan County, IN
Moderate season
182 days
Last Spring Frost
April 18
➔
182 growing days
➔
First Fall Frost
October 17
Sullivan County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Zone 6b
Frost Countdown
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Last Frost: Apr 18
First Frost: Oct 17
Soil & Growing Conditions in Sullivan County
Soil Type
Silt Loam
Ideal for most crops — holds moisture and nutrients while draining well.
Watering Needs
Moderate rainfall (34.6 in.) — plan to water 1–2 times per week during the growing season.
Season Tips
182-day frost-free season
Plenty of time for warm-season crops. Start heat-lovers indoors 6–8 weeks before last frost to maximise your harvest window.
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
Soil Test Kit
$12-25
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Digital pH Meter
$10-20
Get instant, accurate soil pH readings to fine-tune your amendments.
Organic Compost
$8-30
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Sullivan County
107 vegetables that grow well in Zone 6b with planting dates for Sullivan County.
Show all 107 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Amaranth | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Arugula | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jul 25 | 30–50 |
| Asparagus | — | — | May 2 | — | — | 730–1095 |
| Beets | — | Apr 4 | — | Aug 8 | May 30 – Jun 27 | 50–70 |
| Belgian Endive | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Aug 8 – Oct 3 | 110–150 |
| Bitter Melon | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Black Beans | — | Apr 25 | — | — | Jul 25 – Sep 12 | 90–120 |
| Bok Choy | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jul 4 | 40–60 |
| Broccoli | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 20 – Aug 1 | 60–90 |
| Broccoli Rabe | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jul 4 | 40–60 |
| Brussels Sprouts | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 18 – Sep 12 | 90–130 |
| Butternut Squash | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Sep 5 | 85–110 |
| Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 20 – Aug 15 | 60–100 |
| Calabash | Feb 21 | Apr 25 | May 2 | — | Jul 25 – Sep 19 | 80–120 |
| Carrots | — | Apr 4 | — | Aug 8 | Jun 6 – Jul 11 | 60–80 |
| Cauliflower | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 15 | 55–100 |
| Celeriac | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Aug 1 – Sep 5 | 100–120 |
| Celery | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 11 – Sep 5 | 80–120 |
| Celtuce | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 20 – Aug 1 | 60–90 |
| Chard | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 1 | 50–60 |
| Chickpeas | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 11 – Aug 22 | 80–110 |
| Chicory | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 20 – Aug 1 | 60–85 |
| Chinese Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Jul 11 | 50–70 |
| Christmas Lima Beans | Feb 21 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Collard Greens | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 15 | 55–75 |
| Corn | — | Apr 25 | — | — | Jun 27 – Aug 22 | 60–100 |
| Cowpeas | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Cress | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 2 – May 23 | 14–21 |
| Crookneck Squash | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Jul 18 | 45–60 |
| Crosne | — | Apr 4 | — | Aug 8 | Sep 5 – Oct 17 | 150–200 |
| Cucumber | Mar 14 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–70 |
| Daikon | — | Apr 4 | — | Aug 8 | May 30 – Jun 27 | 50–70 |
| Delicata Squash | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Aug 29 | 80–100 |
| Edamame | — | Apr 25 | — | — | Jul 11 – Aug 22 | 75–100 |
| Eggplant | Feb 7 | Apr 25 | May 2 | — | Jul 11 – Sep 12 | 65–85 |
| Endive | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 6 – Jul 11 | 45–65 |
| Escarole | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Jul 11 | 50–70 |
| Fava Beans | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 4 – Aug 15 | 75–100 |
| Fennel | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 15 | 60–90 |
| Garlic | — | — | — | Sep 5 | Dec 5 – Mar 20 | 90–240 |
| Green Beans | — | Apr 25 | — | — | Jun 20 – Aug 15 | 50–65 |
| Horseradish | — | — | May 2 | — | Sep 5 – Nov 14 | 120–180 |
| Hot Peppers | Feb 7 | Apr 25 | May 2 | — | Jul 11 – Oct 17 | 70–120 |
| Hubbard Squash | Mar 14 | Apr 25 | May 2 | — | Aug 15 – Sep 19 | 100–120 |
| Kabocha | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Aug 29 | 85–100 |
| Kai Lan | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 6 – Jul 4 | 45–60 |
| Kale | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 8 | 50–70 |
| Kidney Beans | — | Apr 25 | — | — | Jul 25 – Aug 29 | 85–110 |
| Kohlrabi | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 6 – Jul 11 | 45–65 |
| Komatsuna | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jun 27 | 35–50 |
| Leeks | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 18 – Oct 3 | 90–150 |
| Lentils | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 11 – Aug 22 | 80–110 |
| Lettuce | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Aug 1 | 30–60 |
| Lima Beans | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Loofah | Feb 21 | Apr 25 | May 2 | — | Aug 15 – Oct 17 | 100–150 |
| Luffa | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Oct 17 | 90–150 |
| Mache | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jul 4 | 40–60 |
| Melon | Mar 14 | Apr 25 | May 2 | — | Jul 11 – Aug 29 | 70–100 |
| Microgreens | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Apr 25 – May 23 | 7–21 |
| Mitsuba | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jun 6 – Aug 1 | 50–70 |
| Mizuna | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jun 20 | 30–45 |
| Mustard Greens | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jul 25 | 30–50 |
| Napa Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Jul 18 | 55–75 |
| New Zealand Spinach | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Jul 25 | 55–70 |
| Okra | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–65 |
| Onion | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 18 – Sep 5 | 90–120 |
| Pac Choi | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jun 27 | 40–55 |
| Parsnip | — | Apr 4 | — | Aug 8 | Jul 18 – Aug 29 | 100–130 |
| Patty Pan Squash | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Jul 18 | 45–60 |
| Peas | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 8 | 55–70 |
| Peppers | Feb 7 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Pole Beans | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 55–70 |
| Potatoes | Feb 21 | Apr 25 | May 2 | — | Jul 11 – Sep 19 | 70–120 |
| Pumpkin | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 85–120 |
| Purslane | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jul 4 | 40–60 |
| Radicchio | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 20 – Jul 25 | 60–80 |
| Radish | — | Apr 4 | — | Aug 8 | May 2 – May 23 | 22–35 |
| Rhubarb | — | — | May 9 | — | — | 365–730 |
| Romanesco | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 4 – Aug 15 | 75–100 |
| Rutabaga | — | Apr 4 | — | Aug 8 | Jun 27 – Aug 1 | 80–100 |
| Salsify | — | Apr 4 | — | Aug 8 | Jul 18 – Aug 29 | 100–130 |
| Savoy Cabbage | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 27 – Aug 22 | 70–110 |
| Scallions | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Jul 11 | 50–70 |
| Scarlet Runner Beans | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Aug 8 | 60–80 |
| Shallot | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jul 18 – Sep 5 | 90–120 |
| Shiso | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 50–70 |
| Snap Peas | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 22 | 55–70 |
| Snow Peas | Mar 14 | Apr 4 | Apr 18 | Aug 8 | Jun 13 – Aug 8 | 50–65 |
| Soybeans | — | Apr 25 | — | — | Jul 18 – Sep 12 | 80–120 |
| Spaghetti Squash | Mar 14 | Apr 25 | May 2 | — | Aug 1 – Aug 29 | 85–100 |
| Spinach | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jul 25 | 35–50 |
| Squash (Summer) | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Aug 22 | 45–65 |
| Squash (Winter) | Mar 14 | Apr 25 | May 2 | — | Jul 25 – Sep 19 | 80–120 |
| Sunchoke | — | — | May 2 | — | Aug 22 – Oct 17 | 110–150 |
| Sweet Corn | — | Apr 25 | — | — | Jun 27 – Aug 8 | 60–90 |
| Sweet Potatoes | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Tatsoi | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 23 – Jun 27 | 35–50 |
| Tomatillo | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–85 |
| Tomatoes | Feb 21 | Apr 25 | May 2 | — | Jul 4 – Sep 12 | 60–85 |
| Turnip | — | Apr 4 | — | Aug 8 | May 16 – Jun 20 | 40–60 |
| Watercress | Mar 14 | Apr 4 | Apr 18 | Aug 8 | May 30 – Jul 4 | 40–60 |
| Watermelon | Mar 14 | Apr 25 | May 2 | — | Jul 11 – Aug 29 | 70–100 |
| Wax Beans | — | Apr 25 | — | — | Jun 20 – Aug 15 | 50–65 |
| Winter Melon | Feb 21 | Apr 25 | May 2 | — | Aug 1 – Sep 19 | 90–120 |
| Yard Long Beans | Feb 21 | Apr 25 | May 2 | — | Jun 27 – Aug 8 | 55–80 |
| Zucchini | Mar 14 | Apr 25 | May 2 | — | Jun 20 – Aug 15 | 45–60 |
🍓 Fruits to Grow in Sullivan County
27 fruits that grow well in Zone 6b with planting dates for Sullivan County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 9 | — | Aug 8 – Nov 21 | 90–180 |
| Aronia | — | — | May 9 | — | — | 730–1095 |
| Blackberries | — | — | May 9 | — | — | 365–730 |
| Blueberries | — | — | May 9 | — | — | 730–1095 |
| Boysenberries | — | — | May 9 | — | — | 365–730 |
| Cantaloupe | — | — | May 9 | — | Jul 18 – Aug 22 | 70–90 |
| Che Fruit | — | — | May 9 | — | — | 1095–1825 |
| Cranberries | — | — | May 9 | — | — | 730–1095 |
| Currants | — | — | May 9 | — | — | 730–1095 |
| Elderberries | — | — | May 9 | — | — | 730–1095 |
| Goji Berries | — | — | May 9 | — | — | 730–1095 |
| Gooseberries | — | — | May 9 | — | — | 730–1095 |
| Grapes | — | — | May 9 | — | — | 730–1095 |
| Ground Cherry | — | — | May 9 | — | Jul 18 – Sep 12 | 65–80 |
| Hardy Kiwi | — | — | May 9 | — | — | 1095–1825 |
| Haskaps | — | — | May 9 | — | — | 730–1095 |
| Honeydew | — | — | May 9 | — | Aug 1 – Sep 12 | 80–110 |
| Jostaberry | — | — | May 9 | — | — | 730–1095 |
| Lingonberries | — | — | May 9 | — | — | 730–1095 |
| Medlar | — | — | May 9 | — | — | 1095–1825 |
| Mulberries | — | — | May 9 | — | — | 730–1825 |
| Pawpaw | — | — | May 9 | — | — | 1095–2555 |
| Persimmon | — | — | May 9 | — | — | 1095–2555 |
| Quince | — | — | May 9 | — | — | 1095–1825 |
| Raspberries | — | — | May 9 | — | — | 365–730 |
| Serviceberries | — | — | May 9 | — | — | 730–1095 |
| Strawberries | — | — | May 9 | — | Aug 8 – Nov 21 | 90–365 |
🌿 Herbs to Grow in Sullivan County
35 herbs that grow well in Zone 6b with planting dates for Sullivan County.
Show all 35 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 14 | Apr 4 | Apr 11 | Aug 8 | — | 365–730 |
| Anise | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jul 11 – Sep 26 | 90–120 |
| Basil | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 29 | 50–75 |
| Bee Balm | — | — | Apr 25 | — | Jul 25 – Oct 10 | 90–120 |
| Borage | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jun 6 – Jul 25 | 50–60 |
| Caraway | Mar 14 | Apr 4 | Apr 11 | Aug 8 | — | 365–450 |
| Catnip | — | — | Apr 25 | — | Jun 27 – Aug 29 | 60–80 |
| Chamomile | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jun 13 – Aug 22 | 60–90 |
| Chervil | Mar 14 | Apr 4 | Apr 11 | Aug 8 | May 23 – Jul 25 | 40–60 |
| Chives | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Cilantro | Mar 14 | Apr 4 | Apr 11 | Aug 8 | May 23 – Jul 25 | 40–60 |
| Comfrey | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Cumin | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jul 25 – Sep 26 | 100–120 |
| Dill | Mar 14 | Apr 4 | Apr 11 | Aug 8 | May 23 – Jul 25 | 40–60 |
| Epazote | Feb 28 | Apr 25 | May 2 | — | Jun 20 – Aug 15 | 45–60 |
| Fennel (herb) | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jun 13 – Aug 22 | 60–90 |
| Feverfew | — | — | Apr 25 | — | Jul 25 – Oct 10 | 90–120 |
| Garlic Chives | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Horehound | — | — | Apr 25 | — | Jul 11 – Sep 5 | 75–90 |
| Hyssop | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Lemon Balm | — | — | Apr 25 | — | Jun 27 – Aug 15 | 60–70 |
| Lemon Thyme | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Lovage | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Marjoram | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Mint | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Oregano | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Parsley | Mar 14 | Apr 4 | Apr 11 | Aug 8 | Jun 13 – Aug 15 | 60–80 |
| Rue | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Sage | — | — | Apr 25 | — | Jul 11 – Sep 5 | 75–90 |
| Savory | — | — | Apr 25 | — | Jun 20 – Aug 15 | 50–70 |
| Sorrel | Mar 14 | Apr 4 | Apr 11 | Aug 8 | May 23 – Jul 25 | 40–60 |
| Tarragon | — | — | Apr 25 | — | Jun 27 – Sep 5 | 60–90 |
| Thai Basil | Feb 28 | Apr 25 | May 2 | — | Jun 27 – Aug 29 | 50–75 |
| Thyme | — | — | Apr 25 | — | Jul 4 – Sep 5 | 70–90 |
| Valerian | — | — | Apr 25 | — | Aug 29 – Nov 7 | 120–180 |
🌸 Flowers to Grow in Sullivan County
53 flowers that grow well in Zone 6b with planting dates for Sullivan County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Feb 28 | Apr 18 | Apr 18 | — | Jun 13 – Sep 26 | 60–75 |
| Alliums | — | — | — | Sep 5 | Oct 3 – Oct 31 | 28–42 |
| Anemones | Mar 21 | — | Apr 18 | — | May 16 – Jun 13 | 90–120 |
| Astilbe | Feb 14 | — | Apr 25 | — | Jul 4 – Sep 12 | 70–100 |
| Bachelor's Button | Mar 7 | Mar 21 | Apr 18 | Sep 5 | Jun 20 – Sep 12 | 60–90 |
| Begonias | Feb 7 | — | Apr 25 | — | Jul 4 – Oct 10 | 70–90 |
| Black-eyed Susan | Feb 14 | Apr 18 | Apr 25 | — | Jul 11 – Oct 31 | 60–80 |
| Bleeding Hearts | Feb 14 | — | Apr 25 | — | Jun 20 – Jul 25 | 60–90 |
| Calendula | Mar 7 | Mar 21 | Apr 18 | — | Jun 6 – Sep 12 | 50–70 |
| California Poppy | — | Mar 21 | — | — | May 30 – Jul 25 | 60–90 |
| Celosia | Mar 14 | Apr 25 | Apr 25 | — | Jun 27 – Oct 17 | 60–90 |
| Columbine | Feb 14 | Apr 25 | Apr 25 | — | Jun 20 – Jul 25 | 70–100 |
| Coreopsis | Feb 14 | Apr 18 | Apr 25 | — | Jul 4 – Oct 31 | 60–80 |
| Cosmos | Mar 21 | Apr 18 | Apr 18 | — | Jun 27 – Oct 10 | 60–90 |
| Crocus | — | — | — | Sep 5 | Jul 25 – Aug 15 | 10–20 |
| Daffodils | — | — | — | Sep 5 | Aug 1 – Aug 22 | 20–40 |
| Dahlias | Mar 21 | Apr 25 | Apr 25 | — | Jul 11 – Oct 31 | 70–120 |
| Daylily | Feb 14 | — | Apr 25 | — | Jul 11 – Oct 31 | 60–90 |
| Dianthus | Feb 21 | Mar 21 | Mar 28 | — | May 16 – Aug 15 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 14 | Apr 25 | Apr 25 | — | Jul 11 – Oct 31 | 70–90 |
| Foxglove | Feb 14 | Apr 25 | Apr 25 | — | Jun 20 – Jul 25 | 80–120 |
| Gaillardia (Blanket Flower) | Feb 28 | Apr 25 | Apr 25 | — | Jul 4 – Nov 7 | 70–100 |
| Geraniums | Feb 7 | — | Apr 25 | — | Jul 4 – Oct 10 | 70–100 |
| Gladiolus | — | Apr 18 | Apr 18 | — | Jul 4 – Oct 24 | 70–100 |
| Hostas | Feb 7 | — | Apr 25 | — | Jul 11 – Oct 31 | 60–90 |
| Hyacinths | — | — | — | Sep 5 | Aug 22 – Sep 12 | 14–28 |
| Hydrangeas | Feb 7 | — | Apr 25 | — | Jul 4 – Oct 17 | 90–150 |
| Impatiens | Feb 21 | — | Apr 25 | — | Jul 4 – Oct 17 | 60–75 |
| Irises | — | Division | Apr 25 | — | Jun 20 – Jul 18 | 60–100 |
| Larkspur | — | Mar 21 | — | — | May 30 – Jul 25 | 60–90 |
| Lavender | Feb 7 | — | May 2 | — | Jul 11 – Sep 5 | 90–120 |
| Lilies | — | Division | Apr 25 | — | Jul 4 – Oct 10 | 70–120 |
| Lobelia | Feb 14 | — | Apr 4 | — | May 30 – Aug 22 | 70–80 |
| Lupine | Feb 14 | Apr 25 | Apr 25 | — | Jun 20 – Jul 25 | 75–100 |
| Marigolds | Mar 7 | Apr 18 | Apr 18 | — | Jun 13 – Sep 19 | 50–70 |
| Nasturtium | Mar 21 | Apr 18 | Apr 18 | — | Jun 13 – Oct 10 | 55–65 |
| Pansy | Feb 7 | — | Apr 18 | Aug 22 | Jun 13 – Aug 22 | 70–90 |
| Peonies | — | Division | Apr 25 | — | Jun 27 – Aug 1 | 90–120 |
| Petunia | Feb 21 | — | Apr 25 | — | Jul 4 – Oct 17 | 70–90 |
| Phlox | Feb 14 | Apr 25 | Apr 25 | — | Jul 4 – Sep 26 | 80–110 |
| Portulaca | Mar 14 | Apr 25 | Apr 25 | — | Jun 13 – Oct 3 | 50–70 |
| Ranunculus | Mar 7 | — | Apr 18 | — | May 23 – Jun 20 | 90–120 |
| Roses | Feb 7 | — | Apr 25 | — | Jul 4 – Oct 31 | 90–180 |
| Salvia | Feb 14 | — | Apr 18 | — | Jun 27 – Oct 10 | 70–90 |
| Sedum (Stonecrop) | Feb 14 | — | Apr 25 | — | Aug 15 – Nov 7 | 60–90 |
| Snapdragon | Feb 7 | Mar 28 | Apr 18 | — | Jun 27 – Sep 12 | 70–100 |
| Sunflower | Mar 28 | Apr 18 | Apr 18 | — | Jul 11 – Oct 10 | 70–100 |
| Sweet Alyssum | Mar 7 | Mar 28 | Apr 18 | — | May 30 – Aug 15 | 45–60 |
| Sweet Pea | Mar 7 | Mar 14 | Apr 18 | — | Jul 4 – Sep 12 | 65–85 |
| Tulips | — | — | — | Sep 12 | Aug 22 – Sep 19 | 15–30 |
| Vinca (Annual) | Feb 7 | — | Apr 25 | — | Jul 4 – Oct 17 | 70–90 |
| Yarrow | Feb 14 | Apr 18 | Apr 25 | — | Jul 4 – Oct 31 | 60–90 |
| Zinnia | Mar 21 | Apr 18 | Apr 18 | — | Jun 27 – Oct 3 | 60–70 |
Monthly Planting Guide for Sullivan County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Sullivan County.
Frequently Asked Questions
What planting zone is Sullivan County, IN?
Sullivan County is in USDA Hardiness Zone 6b. 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 Sullivan County, IN?
Based on 30 years of NOAA weather station data, the median last spring frost in Sullivan County falls around April 18. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Sullivan County, IN?
The median first fall frost in Sullivan County arrives around October 17. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Your Sullivan County Garden Planner — Free
A 22-page printable planner built for Sullivan County (Zone 6b). 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
$27
$293 value
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
$27
$157 value
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
$27
$210 value
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