Weld County, CO — Planting Guide
Weld County is in USDA Zone 5b. The average last spring frost is May 2 and the first fall frost is October 7, giving you a growing season of approximately 158 days.
At an elevation of 6,992 ft, Weld County receives approximately 18.8 in of rainfall annually. Summer highs average 87°F with winter lows around 17°F. The predominant soil type is Loam.
🌡️ Zone
5b (-15°F to -10°F min)
❄️ Last Frost
May 2
🍂 First Frost
October 7
📅 Growing Season
158 days
⛰️ Elevation
6,992 ft
🌧️ Annual Rainfall
18.8 in
Weld County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Soil & Growing Conditions in Weld County
Soil Type
Loam
Ideal for most crops — holds moisture and nutrients while draining well.
Watering Needs
With 18.8 inches annually, regular irrigation is essential. Drip systems and heavy mulching conserve water.
Season Tips
158-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 Weld County
105 vegetables that grow well in Zone 5b with planting dates for Weld 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 29 | Jun 6 – Aug 8 | 30–50 |
| Asparagus | — | — | May 16 | — | — | 730–1095 |
| Beets | — | Apr 18 | — | Jul 29 | Jun 13 – Jul 11 | 50–70 |
| Belgian Endive | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | Jun 13 – Jul 18 | 40–60 |
| Broccoli | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 4 – Aug 15 | 60–90 |
| Broccoli Rabe | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 13 – Jul 18 | 40–60 |
| Brussels Sprouts | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | Jul 4 – Aug 29 | 60–100 |
| Calabash | Mar 7 | May 9 | May 16 | — | Aug 8 – Oct 3 | 80–120 |
| Carrots | — | Apr 18 | — | Jul 29 | Jun 20 – Jul 25 | 60–80 |
| Cauliflower | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 27 – Aug 29 | 55–100 |
| Celeriac | Mar 28 | Apr 18 | May 2 | Jul 29 | Aug 15 – Sep 19 | 100–120 |
| Celery | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 25 – Sep 19 | 80–120 |
| Celtuce | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 4 – Aug 15 | 60–90 |
| Chard | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 27 – Aug 15 | 50–60 |
| Chickpeas | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 25 – Sep 5 | 80–110 |
| Chicory | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 4 – Aug 15 | 60–85 |
| Chinese Cabbage | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | 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 29 | May 16 – Jun 6 | 14–21 |
| Crookneck Squash | Mar 28 | May 9 | May 16 | — | Jul 4 – Aug 1 | 45–60 |
| Crosne | — | Apr 18 | — | Jul 29 | Sep 19 – Oct 3 | 150–200 |
| Cucumber | Mar 28 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–70 |
| Daikon | — | Apr 18 | — | Jul 29 | 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 29 | Jun 20 – Jul 25 | 45–65 |
| Escarole | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 27 – Jul 25 | 50–70 |
| Fava Beans | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 18 – Aug 29 | 75–100 |
| Fennel | Mar 7 | May 9 | May 16 | — | Jul 18 – Aug 29 | 60–90 |
| Garlic | — | — | — | Aug 26 | Nov 25 – Feb 10 | 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 29 | Jun 20 – Jul 18 | 45–60 |
| Kale | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 27 – Aug 22 | 50–70 |
| Kidney Beans | — | May 9 | — | — | Aug 8 – Sep 12 | 85–110 |
| Kohlrabi | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 20 – Jul 25 | 45–65 |
| Komatsuna | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 6 – Jul 11 | 35–50 |
| Leeks | Mar 28 | Apr 18 | May 2 | Jul 29 | Aug 1 – Oct 17 | 90–150 |
| Lentils | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 25 – Sep 5 | 80–110 |
| Lettuce | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 6 – Aug 15 | 30–60 |
| Lima Beans | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Mache | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | May 9 – Jun 6 | 7–21 |
| Mitsuba | Mar 28 | Apr 18 | Apr 25 | Jul 29 | Jun 20 – Aug 15 | 50–70 |
| Mizuna | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 6 – Jul 4 | 30–45 |
| Mustard Greens | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 6 – Aug 8 | 30–50 |
| Napa Cabbage | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | Aug 1 – Sep 19 | 90–120 |
| Pac Choi | Mar 28 | Apr 18 | May 2 | Jul 29 | Jun 13 – Jul 11 | 40–55 |
| Parsnip | — | Apr 18 | — | Jul 29 | 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 29 | 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 29 | Jun 13 – Jul 18 | 40–60 |
| Radicchio | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 4 – Aug 8 | 60–80 |
| Radish | — | Apr 18 | — | Jul 29 | May 16 – Jun 6 | 22–35 |
| Rhubarb | — | — | May 23 | — | — | 365–730 |
| Romanesco | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 18 – Aug 29 | 75–100 |
| Rutabaga | — | Apr 18 | — | Jul 29 | Jul 11 – Aug 15 | 80–100 |
| Salsify | — | Apr 18 | — | Jul 29 | Aug 1 – Sep 12 | 100–130 |
| Savoy Cabbage | Mar 28 | Apr 18 | May 2 | Jul 29 | Jul 11 – Sep 5 | 70–110 |
| Scallions | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 29 | 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 29 | 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 29 | 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 29 | 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 29 | May 30 – Jul 4 | 40–60 |
| Watercress | Mar 28 | Apr 18 | May 2 | Jul 29 | 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 Weld County
27 fruits that grow well in Zone 5b with planting dates for Weld 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 Weld County
34 herbs that grow well in Zone 5b with planting dates for Weld 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 29 | — | 365–730 |
| Anise | Mar 28 | Apr 18 | Apr 25 | Jul 29 | 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 29 | Jun 20 – Aug 8 | 50–60 |
| Caraway | Mar 28 | Apr 18 | Apr 25 | Jul 29 | — | 365–450 |
| Catnip | — | — | May 9 | — | Jul 11 – Sep 12 | 60–80 |
| Chamomile | Mar 28 | Apr 18 | Apr 25 | Jul 29 | Jun 27 – Sep 5 | 60–90 |
| Chervil | Mar 28 | Apr 18 | Apr 25 | Jul 29 | Jun 6 – Aug 8 | 40–60 |
| Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cilantro | Mar 28 | Apr 18 | Apr 25 | Jul 29 | Jun 6 – Aug 8 | 40–60 |
| Comfrey | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cumin | Mar 28 | Apr 18 | Apr 25 | Jul 29 | Aug 8 – Oct 10 | 100–120 |
| Dill | Mar 28 | Apr 18 | Apr 25 | Jul 29 | 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 29 | 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 29 | 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 29 | 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 Weld County
51 flowers that grow well in Zone 5b with planting dates for Weld 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 – Oct 3 | 60–75 |
| Alliums | — | — | — | Aug 26 | Sep 30 – Oct 21 | 28–42 |
| Anemones | Apr 4 | — | May 2 | — | Jun 6 – Jul 4 | 90–120 |
| Astilbe | Feb 28 | — | May 16 | — | Aug 1 – Oct 10 | 70–100 |
| Bachelor's Button | Mar 21 | Apr 11 | May 2 | — | Jul 4 – Sep 19 | 60–90 |
| Begonias | Feb 21 | — | May 9 | — | Jul 18 – Oct 10 | 70–90 |
| Black-eyed Susan | Feb 28 | May 2 | May 16 | — | Aug 1 – Nov 7 | 60–80 |
| Bleeding Hearts | Feb 28 | — | May 16 | — | Jul 11 – Aug 22 | 60–90 |
| Calendula | Mar 21 | Apr 11 | May 2 | — | Jun 20 – Sep 19 | 50–70 |
| Celosia | Mar 28 | May 9 | May 9 | — | Jul 11 – 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 – Nov 7 | 60–80 |
| Cosmos | Apr 4 | May 2 | May 2 | — | Jul 11 – Oct 10 | 60–90 |
| Crocus | — | — | — | Aug 26 | Jul 8 – Jul 29 | 10–20 |
| Daffodils | — | — | — | Aug 26 | Jul 15 – Aug 5 | 20–40 |
| Dahlias | Apr 4 | May 9 | May 9 | — | Aug 1 – Oct 31 | 70–120 |
| Daylily | Feb 28 | — | May 16 | — | Aug 8 – Nov 7 | 60–90 |
| Dianthus | Feb 28 | Apr 4 | Apr 18 | — | Jun 6 – Aug 29 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 28 | May 16 | May 16 | — | Aug 8 – Nov 7 | 70–90 |
| Foxglove | Feb 28 | May 16 | May 16 | — | Jul 11 – Aug 22 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 7 | May 9 | May 9 | — | Jul 18 – Nov 7 | 70–100 |
| Geraniums | Feb 21 | — | May 9 | — | Jul 18 – Oct 10 | 70–100 |
| Gladiolus | — | May 9 | May 9 | — | Aug 1 – Oct 31 | 70–100 |
| Hostas | Feb 21 | — | May 16 | — | Aug 8 – Nov 7 | 60–90 |
| Hyacinths | — | — | — | Aug 26 | Aug 5 – Sep 2 | 14–28 |
| Hydrangeas | Feb 21 | — | May 16 | — | Aug 1 – Oct 24 | 90–150 |
| Impatiens | Mar 7 | — | May 9 | — | Jul 18 – Oct 17 | 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 19 | 90–120 |
| Lilies | — | Division | May 16 | — | Jul 25 – Oct 24 | 70–120 |
| Lobelia | Feb 21 | — | Apr 25 | — | Jun 20 – Sep 5 | 70–80 |
| Lupine | Feb 28 | May 16 | May 16 | — | Jul 11 – Aug 22 | 75–100 |
| Marigolds | Mar 21 | May 9 | May 9 | — | Jul 4 – Oct 3 | 50–70 |
| Nasturtium | Apr 4 | May 9 | May 9 | — | Jul 4 – Oct 17 | 55–65 |
| Pansy | Feb 21 | — | May 2 | — | Jun 27 – Aug 29 | 70–90 |
| Peonies | — | Division | May 16 | — | Jul 25 – Sep 5 | 90–120 |
| Petunia | Mar 7 | — | May 9 | — | Jul 18 – Oct 17 | 70–90 |
| Phlox | Feb 28 | May 16 | May 16 | — | Aug 1 – Oct 24 | 80–110 |
| Portulaca | Mar 28 | May 9 | May 9 | — | Jun 27 – Oct 3 | 50–70 |
| Roses | Feb 21 | — | May 16 | — | Aug 1 – Nov 7 | 90–180 |
| Salvia | Feb 28 | — | May 9 | — | Jul 18 – Oct 17 | 70–90 |
| Sedum (Stonecrop) | Feb 28 | — | May 16 | — | Sep 12 – Nov 21 | 60–90 |
| Snapdragon | Feb 21 | Apr 18 | May 2 | — | Jul 11 – Sep 19 | 70–100 |
| Sunflower | Apr 11 | May 9 | May 9 | — | Aug 1 – Oct 17 | 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 26 | Jul 29 – Aug 19 | 15–30 |
| Vinca (Annual) | Feb 14 | — | May 9 | — | Jul 18 – Oct 10 | 70–90 |
| Yarrow | Feb 28 | May 2 | May 16 | — | Jul 25 – Nov 7 | 60–90 |
| Zinnia | Apr 4 | May 9 | May 9 | — | Jul 18 – Oct 17 | 60–70 |
Monthly Planting Guide for Weld County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Weld County.
Frequently Asked Questions
What planting zone is Weld County, CO?
Weld County is in USDA Hardiness Zone 5b. 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 Weld County, CO?
Based on 30 years of NOAA weather station data, the median last spring frost in Weld County falls around May 2. Plan transplants and direct-sow dates relative to this date.
When is the first fall frost in Weld County, CO?
The median first fall frost in Weld County arrives around October 7. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
Your Weld County Garden Planner — Free
A 22-page printable planner built for Weld 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