Adams County, CO — Planting Guide
Adams County is in USDA Zone 6a. The average last spring frost is May 4 and the first fall frost is October 5, giving you a growing season of approximately 154 days.
At an elevation of 5,827 ft, Adams County receives approximately 23.9 in of rainfall annually. Summer highs average 87°F with winter lows around 18°F. The predominant soil type is Loam.
🌡️ Zone
6a (-10°F to -5°F min)
❄️ Last Frost
May 4
🍂 First Frost
October 5
📅 Growing Season
154 days
⛰️ Elevation
5,827 ft
🌧️ Annual Rainfall
23.9 in
Adams County, CO
Moderate season
154 days
Last Spring Frost
May 4
➔
154 growing days
➔
First Fall Frost
October 5
Adams County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Zone 6a
Frost Countdown
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Last Frost: May 4
First Frost: Oct 5
Soil & Growing Conditions in Adams County
Soil Type
Loam
Ideal for most crops — holds moisture and nutrients while draining well.
Watering Needs
With 23.9 inches annually, regular irrigation is essential. Drip systems and heavy mulching conserve water.
Season Tips
154-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
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 Adams County
107 vegetables that grow well in Zone 6a with planting dates for Adams County.
Show all 107 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 30 | May 11 | May 18 | — | Aug 10 – Sep 14 | 80–100 |
| Amaranth | Mar 9 | May 11 | May 18 | — | Aug 17 – Oct 5 | 90–120 |
| Arugula | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Aug 10 | 30–50 |
| Asparagus | — | — | May 18 | — | — | 730–1095 |
| Beets | — | Apr 20 | — | Jul 27 | Jun 15 – Jul 13 | 50–70 |
| Belgian Endive | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 24 – Oct 19 | 110–150 |
| Bitter Melon | Mar 9 | May 11 | May 18 | — | Jul 20 – Aug 31 | 60–90 |
| Black Beans | — | May 11 | — | — | Aug 10 – Sep 28 | 90–120 |
| Bok Choy | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 20 | 40–60 |
| Broccoli | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 6 – Aug 17 | 60–90 |
| Broccoli Rabe | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 20 | 40–60 |
| Brussels Sprouts | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 3 – Sep 28 | 90–130 |
| Butternut Squash | Mar 30 | May 11 | May 18 | — | Aug 17 – Sep 21 | 85–110 |
| Cabbage | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 6 – Aug 31 | 60–100 |
| Calabash | Mar 9 | May 11 | May 18 | — | Aug 10 – Oct 5 | 80–120 |
| Carrots | — | Apr 20 | — | Jul 27 | Jun 22 – Jul 27 | 60–80 |
| Cauliflower | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 31 | 55–100 |
| Celeriac | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 17 – Sep 21 | 100–120 |
| Celery | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 27 – Sep 21 | 80–120 |
| Celtuce | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 6 – Aug 17 | 60–90 |
| Chard | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 17 | 50–60 |
| Chickpeas | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 27 – Sep 7 | 80–110 |
| Chicory | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 6 – Aug 17 | 60–85 |
| Chinese Cabbage | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Jul 27 | 50–70 |
| Christmas Lima Beans | Mar 9 | May 11 | May 18 | — | Aug 10 – Sep 14 | 80–100 |
| Collard Greens | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 31 | 55–75 |
| Corn | — | May 11 | — | — | Jul 13 – Sep 7 | 60–100 |
| Cowpeas | — | May 11 | — | — | Jul 13 – Aug 24 | 60–90 |
| Cress | Mar 30 | Apr 20 | May 4 | Jul 27 | May 18 – Jun 8 | 14–21 |
| Crookneck Squash | Mar 30 | May 11 | May 18 | — | Jul 6 – Aug 3 | 45–60 |
| Crosne | — | Apr 20 | — | Jul 27 | Sep 21 – Nov 2 | 150–200 |
| Cucumber | Mar 30 | May 11 | May 18 | — | Jul 13 – Sep 7 | 50–70 |
| Daikon | — | Apr 20 | — | Jul 27 | Jun 15 – Jul 13 | 50–70 |
| Delicata Squash | Mar 30 | May 11 | May 18 | — | Aug 10 – Sep 14 | 80–100 |
| Edamame | — | May 11 | — | — | Jul 27 – Sep 7 | 75–100 |
| Eggplant | Feb 23 | May 11 | May 18 | — | Jul 27 – Sep 28 | 65–85 |
| Endive | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 22 – Jul 27 | 45–65 |
| Escarole | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Jul 27 | 50–70 |
| Fava Beans | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 20 – Aug 31 | 75–100 |
| Fennel | Mar 9 | May 11 | May 18 | — | Jul 20 – Aug 31 | 60–90 |
| Garlic | — | — | — | Aug 24 | Nov 23 – Mar 8 | 90–240 |
| Green Beans | — | May 11 | — | — | Jul 6 – Aug 31 | 50–65 |
| Horseradish | — | — | May 18 | — | Sep 21 – Nov 30 | 120–180 |
| Hot Peppers | Feb 23 | May 11 | May 18 | — | Jul 27 – Nov 2 | 70–120 |
| Hubbard Squash | Mar 30 | May 11 | May 18 | — | Aug 31 – Oct 5 | 100–120 |
| Kabocha | Mar 30 | May 11 | May 18 | — | Aug 17 – Sep 14 | 85–100 |
| Kai Lan | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 22 – Jul 20 | 45–60 |
| Kale | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 24 | 50–70 |
| Kidney Beans | — | May 11 | — | — | Aug 10 – Sep 14 | 85–110 |
| Kohlrabi | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 22 – Jul 27 | 45–65 |
| Komatsuna | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Jul 13 | 35–50 |
| Leeks | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 3 – Oct 19 | 90–150 |
| Lentils | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 27 – Sep 7 | 80–110 |
| Lettuce | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Aug 17 | 30–60 |
| Lima Beans | — | May 11 | — | — | Jul 13 – Aug 24 | 60–90 |
| Loofah | Mar 9 | May 11 | May 18 | — | Aug 31 – Nov 2 | 100–150 |
| Luffa | Mar 9 | May 11 | May 18 | — | Aug 17 – Nov 2 | 90–150 |
| Mache | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 20 | 40–60 |
| Melon | Mar 30 | May 11 | May 18 | — | Jul 27 – Sep 14 | 70–100 |
| Microgreens | Mar 30 | Apr 20 | May 4 | Jul 27 | May 11 – Jun 8 | 7–21 |
| Mitsuba | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 22 – Aug 17 | 50–70 |
| Mizuna | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Jul 6 | 30–45 |
| Mustard Greens | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Aug 10 | 30–50 |
| Napa Cabbage | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 3 | 55–75 |
| New Zealand Spinach | Mar 9 | May 11 | May 18 | — | Jul 13 – Aug 10 | 55–70 |
| Okra | Mar 9 | May 11 | May 18 | — | Jul 13 – Sep 7 | 50–65 |
| Onion | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 3 – Sep 21 | 90–120 |
| Pac Choi | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 13 | 40–55 |
| Parsnip | — | Apr 20 | — | Jul 27 | Aug 3 – Sep 14 | 100–130 |
| Patty Pan Squash | Mar 30 | May 11 | May 18 | — | Jul 6 – Aug 3 | 45–60 |
| Peas | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 24 | 55–70 |
| Peppers | Feb 23 | May 11 | May 18 | — | Jul 20 – Sep 28 | 60–90 |
| Pole Beans | Mar 9 | May 11 | May 18 | — | Jul 13 – Sep 7 | 55–70 |
| Potatoes | Mar 9 | May 11 | May 18 | — | Jul 27 – Oct 5 | 70–120 |
| Pumpkin | Mar 30 | May 11 | May 18 | — | Aug 17 – Oct 5 | 85–120 |
| Purslane | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 20 | 40–60 |
| Radicchio | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 6 – Aug 10 | 60–80 |
| Radish | — | Apr 20 | — | Jul 27 | May 18 – Jun 8 | 22–35 |
| Rhubarb | — | — | May 25 | — | — | 365–730 |
| Romanesco | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 20 – Aug 31 | 75–100 |
| Rutabaga | — | Apr 20 | — | Jul 27 | Jul 13 – Aug 17 | 80–100 |
| Salsify | — | Apr 20 | — | Jul 27 | Aug 3 – Sep 14 | 100–130 |
| Savoy Cabbage | Mar 30 | Apr 20 | May 4 | Jul 27 | Jul 13 – Sep 7 | 70–110 |
| Scallions | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Jul 27 | 50–70 |
| Scarlet Runner Beans | Mar 9 | May 11 | May 18 | — | Jul 20 – Aug 24 | 60–80 |
| Shallot | Mar 30 | Apr 20 | May 4 | Jul 27 | Aug 3 – Sep 21 | 90–120 |
| Shiso | Mar 16 | May 11 | May 18 | — | Jul 13 – Sep 7 | 50–70 |
| Snap Peas | Mar 9 | May 11 | May 18 | — | Jul 13 – Sep 7 | 55–70 |
| Snow Peas | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 29 – Aug 24 | 50–65 |
| Soybeans | — | May 11 | — | — | Aug 3 – Sep 28 | 80–120 |
| Spaghetti Squash | Mar 30 | May 11 | May 18 | — | Aug 17 – Sep 14 | 85–100 |
| Spinach | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Aug 10 | 35–50 |
| Squash (Summer) | Mar 30 | May 11 | May 18 | — | Jul 6 – Sep 7 | 45–65 |
| Squash (Winter) | Mar 30 | May 11 | May 18 | — | Aug 10 – Oct 5 | 80–120 |
| Sunchoke | — | — | May 18 | — | Sep 7 – Nov 2 | 110–150 |
| Sweet Corn | — | May 11 | — | — | Jul 13 – Aug 24 | 60–90 |
| Sweet Potatoes | Mar 9 | May 11 | May 18 | — | Aug 17 – Oct 5 | 90–120 |
| Tatsoi | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 8 – Jul 13 | 35–50 |
| Tomatillo | Mar 9 | May 11 | May 18 | — | Jul 20 – Sep 28 | 60–85 |
| Tomatoes | Mar 9 | May 11 | May 18 | — | Jul 20 – Sep 28 | 60–85 |
| Turnip | — | Apr 20 | — | Jul 27 | Jun 1 – Jul 6 | 40–60 |
| Watercress | Mar 30 | Apr 20 | May 4 | Jul 27 | Jun 15 – Jul 20 | 40–60 |
| Watermelon | Mar 30 | May 11 | May 18 | — | Jul 27 – Sep 14 | 70–100 |
| Wax Beans | — | May 11 | — | — | Jul 6 – Aug 31 | 50–65 |
| Winter Melon | Mar 9 | May 11 | May 18 | — | Aug 17 – Oct 5 | 90–120 |
| Yard Long Beans | Mar 9 | May 11 | May 18 | — | Jul 13 – Aug 24 | 55–80 |
| Zucchini | Mar 30 | May 11 | May 18 | — | Jul 6 – Aug 31 | 45–60 |
🍓 Fruits to Grow in Adams County
27 fruits that grow well in Zone 6a with planting dates for Adams County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 25 | — | Aug 24 – Dec 7 | 90–180 |
| Aronia | — | — | May 25 | — | — | 730–1095 |
| Blackberries | — | — | May 25 | — | — | 365–730 |
| Blueberries | — | — | May 25 | — | — | 730–1095 |
| Boysenberries | — | — | May 25 | — | — | 365–730 |
| Cantaloupe | — | — | May 25 | — | Aug 3 – Sep 7 | 70–90 |
| Che Fruit | — | — | May 25 | — | — | 1095–1825 |
| Cranberries | — | — | May 25 | — | — | 730–1095 |
| Currants | — | — | May 25 | — | — | 730–1095 |
| Elderberries | — | — | May 25 | — | — | 730–1095 |
| Goji Berries | — | — | May 25 | — | — | 730–1095 |
| Gooseberries | — | — | May 25 | — | — | 730–1095 |
| Grapes | — | — | May 25 | — | — | 730–1095 |
| Ground Cherry | — | — | May 25 | — | Aug 3 – Sep 28 | 65–80 |
| Hardy Kiwi | — | — | May 25 | — | — | 1095–1825 |
| Haskaps | — | — | May 25 | — | — | 730–1095 |
| Honeydew | — | — | May 25 | — | Aug 17 – Sep 28 | 80–110 |
| Jostaberry | — | — | May 25 | — | — | 730–1095 |
| Lingonberries | — | — | May 25 | — | — | 730–1095 |
| Medlar | — | — | May 25 | — | — | 1095–1825 |
| Mulberries | — | — | May 25 | — | — | 730–1825 |
| Pawpaw | — | — | May 25 | — | — | 1095–2555 |
| Persimmon | — | — | May 25 | — | — | 1095–2555 |
| Quince | — | — | May 25 | — | — | 1095–1825 |
| Raspberries | — | — | May 25 | — | — | 365–730 |
| Serviceberries | — | — | May 25 | — | — | 730–1095 |
| Strawberries | — | — | May 25 | — | Aug 24 – Dec 7 | 90–365 |
🌿 Herbs to Grow in Adams County
35 herbs that grow well in Zone 6a with planting dates for Adams County.
Show all 35 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 30 | Apr 20 | Apr 27 | Jul 27 | — | 365–730 |
| Anise | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jul 27 – Oct 12 | 90–120 |
| Basil | Mar 16 | May 11 | May 18 | — | Jul 13 – Sep 14 | 50–75 |
| Bee Balm | — | — | May 11 | — | Aug 10 – Oct 26 | 90–120 |
| Borage | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 22 – Aug 10 | 50–60 |
| Caraway | Mar 30 | Apr 20 | Apr 27 | Jul 27 | — | 365–450 |
| Catnip | — | — | May 11 | — | Jul 13 – Sep 14 | 60–80 |
| Chamomile | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 29 – Sep 7 | 60–90 |
| Chervil | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 8 – Aug 10 | 40–60 |
| Chives | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Cilantro | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 8 – Aug 10 | 40–60 |
| Comfrey | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Cumin | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Aug 10 – Oct 12 | 100–120 |
| Dill | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 8 – Aug 10 | 40–60 |
| Epazote | Mar 16 | May 11 | May 18 | — | Jul 6 – Aug 31 | 45–60 |
| Fennel (herb) | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 29 – Sep 7 | 60–90 |
| Feverfew | — | — | May 11 | — | Aug 10 – Oct 26 | 90–120 |
| Garlic Chives | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Horehound | — | — | May 11 | — | Jul 27 – Sep 21 | 75–90 |
| Hyssop | — | — | May 11 | — | Jul 20 – Sep 21 | 70–90 |
| Lemon Balm | — | — | May 11 | — | Jul 13 – Aug 31 | 60–70 |
| Lemon Thyme | — | — | May 11 | — | Jul 20 – Sep 21 | 70–90 |
| Lovage | — | — | May 11 | — | Jul 20 – Sep 21 | 70–90 |
| Marjoram | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Mint | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Oregano | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Parsley | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 29 – Aug 31 | 60–80 |
| Rue | — | — | May 11 | — | Jul 20 – Sep 21 | 70–90 |
| Sage | — | — | May 11 | — | Jul 27 – Sep 21 | 75–90 |
| Savory | — | — | May 11 | — | Jul 6 – Aug 31 | 50–70 |
| Sorrel | Mar 30 | Apr 20 | Apr 27 | Jul 27 | Jun 8 – Aug 10 | 40–60 |
| Tarragon | — | — | May 11 | — | Jul 13 – Sep 21 | 60–90 |
| Thai Basil | Mar 16 | May 11 | May 18 | — | Jul 13 – Sep 14 | 50–75 |
| Thyme | — | — | May 11 | — | Jul 20 – Sep 21 | 70–90 |
| Valerian | — | — | May 11 | — | Sep 14 – Nov 23 | 120–180 |
🌸 Flowers to Grow in Adams County
53 flowers that grow well in Zone 6a with planting dates for Adams County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 16 | May 4 | May 4 | — | Jun 29 – Oct 5 | 60–75 |
| Alliums | — | — | — | Aug 24 | Sep 21 – Oct 19 | 28–42 |
| Anemones | Apr 6 | — | May 4 | — | Jun 8 – Jul 6 | 90–120 |
| Astilbe | Mar 2 | — | May 11 | — | Jul 20 – Sep 28 | 70–100 |
| Bachelor's Button | Mar 23 | Apr 6 | May 4 | Aug 24 | Jul 6 – Sep 21 | 60–90 |
| Begonias | Feb 23 | — | May 11 | — | Jul 20 – Oct 19 | 70–90 |
| Black-eyed Susan | Mar 2 | May 4 | May 11 | — | Jul 27 – Nov 9 | 60–80 |
| Bleeding Hearts | Mar 2 | — | May 11 | — | Jul 6 – Aug 10 | 60–90 |
| Calendula | Mar 23 | Apr 6 | May 4 | — | Jun 22 – Sep 21 | 50–70 |
| California Poppy | — | Apr 6 | — | — | Jun 15 – Jul 27 | 60–90 |
| Celosia | Mar 30 | May 11 | May 11 | — | Jul 13 – Oct 26 | 60–90 |
| Columbine | Mar 2 | May 18 | May 18 | — | Jul 13 – Aug 17 | 70–100 |
| Coreopsis | Mar 2 | May 11 | May 11 | — | Jul 20 – Nov 9 | 60–80 |
| Cosmos | Apr 6 | May 4 | May 4 | — | Jul 13 – Oct 19 | 60–90 |
| Crocus | — | — | — | Aug 24 | Jul 13 – Aug 3 | 10–20 |
| Daffodils | — | — | — | Aug 24 | Jul 20 – Aug 10 | 20–40 |
| Dahlias | Apr 6 | May 11 | May 11 | — | Jul 27 – Nov 9 | 70–120 |
| Daylily | Mar 2 | — | May 11 | — | Jul 27 – Nov 9 | 60–90 |
| Dianthus | Mar 9 | Apr 6 | Apr 20 | — | Jun 8 – Sep 7 | 60–80 |
| Echinacea (Purple Coneflower) | Mar 2 | May 18 | May 18 | — | Aug 10 – Nov 16 | 70–90 |
| Foxglove | Mar 2 | May 11 | May 11 | — | Jul 6 – Aug 10 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 16 | May 11 | May 11 | — | Jul 20 – Nov 23 | 70–100 |
| Geraniums | Feb 23 | — | May 11 | — | Jul 20 – Oct 19 | 70–100 |
| Gladiolus | — | May 4 | May 4 | — | Jul 20 – Nov 2 | 70–100 |
| Hostas | Feb 23 | — | May 11 | — | Jul 27 – Nov 9 | 60–90 |
| Hyacinths | — | — | — | Aug 24 | Aug 10 – Aug 31 | 14–28 |
| Hydrangeas | Feb 23 | — | May 11 | — | Jul 20 – Oct 26 | 90–150 |
| Impatiens | Mar 9 | — | May 11 | — | Jul 20 – Oct 26 | 60–75 |
| Irises | — | Division | May 11 | — | Jul 6 – Aug 3 | 60–100 |
| Larkspur | — | Apr 6 | — | — | Jun 15 – Aug 10 | 60–90 |
| Lavender | Feb 23 | — | May 18 | — | Jul 27 – Sep 21 | 90–120 |
| Lilies | — | Division | May 11 | — | Jul 20 – Oct 26 | 70–120 |
| Lobelia | Mar 2 | — | Apr 20 | — | Jun 15 – Sep 7 | 70–80 |
| Lupine | Mar 2 | May 11 | May 11 | — | Jul 6 – Aug 10 | 75–100 |
| Marigolds | Mar 23 | May 11 | May 11 | — | Jul 6 – Oct 5 | 50–70 |
| Nasturtium | Apr 6 | May 11 | May 11 | — | Jul 6 – Oct 26 | 55–65 |
| Pansy | Feb 23 | — | May 4 | Aug 10 | Jun 29 – Aug 31 | 70–90 |
| Peonies | — | Division | May 11 | — | Jul 13 – Aug 17 | 90–120 |
| Petunia | Mar 9 | — | May 11 | — | Jul 20 – Oct 26 | 70–90 |
| Phlox | Mar 2 | May 11 | May 11 | — | Jul 20 – Oct 12 | 80–110 |
| Portulaca | Mar 30 | May 11 | May 11 | — | Jun 29 – Oct 12 | 50–70 |
| Ranunculus | Mar 23 | — | May 4 | — | Jun 15 – Jul 13 | 90–120 |
| Roses | Feb 23 | — | May 11 | — | Jul 20 – Nov 9 | 90–180 |
| Salvia | Mar 2 | — | May 11 | — | Jul 20 – Oct 26 | 70–90 |
| Sedum (Stonecrop) | Mar 2 | — | May 11 | — | Aug 31 – Nov 16 | 60–90 |
| Snapdragon | Feb 23 | Apr 13 | May 4 | — | Jul 13 – Sep 21 | 70–100 |
| Sunflower | Apr 13 | May 11 | May 11 | — | Aug 3 – Oct 26 | 70–100 |
| Sweet Alyssum | Mar 16 | Apr 13 | May 4 | — | Jun 15 – Aug 24 | 45–60 |
| Sweet Pea | Mar 23 | Mar 30 | May 4 | — | Jul 20 – Sep 28 | 65–85 |
| Tulips | — | — | — | Aug 24 | Aug 3 – Aug 31 | 15–30 |
| Vinca (Annual) | Feb 23 | — | May 11 | — | Jul 20 – Oct 26 | 70–90 |
| Yarrow | Mar 2 | May 4 | May 11 | — | Jul 20 – Nov 9 | 60–90 |
| Zinnia | Apr 6 | May 11 | May 11 | — | Jul 20 – Oct 26 | 60–70 |
Monthly Planting Guide for Adams County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Adams County.
Frequently Asked Questions
What planting zone is Adams County, CO?
Adams County is in USDA Hardiness Zone 6a. 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 Adams County, CO?
Based on 30 years of NOAA weather station data, the median last spring frost in Adams County falls around May 4. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Adams County, CO?
The median first fall frost in Adams County arrives around October 5. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Your Adams County Garden Planner — Free
A 22-page printable planner built for Adams County (Zone 6a). 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