When to Plant Cosmos in Zone 3A
USDA Zone
3A
Cities Covered
25
Avg Last Frost
Monday, May 25, 2026
Plant Type
Direct Sow
📅 Planting Calendar for Zone 3A
Direct Sow Outdoors Monday, May 25, 2026
Pro Tip: Cosmos can be directly sown outdoors. Plant 0 weeks before your last frost date.
🌿 Plant Details
Scientific Name Cosmos bipinnatus
Days to Maturity 60 days
Sun Requirements Full Sun (6-8 hours)
Plant Spacing 18" apart
Cities in Zone 3A
Embarrass, Minnesota Soudan, Minnesota Tower, Minnesota Loman, Minnesota Ranier, Minnesota Swift, Minnesota Oak Island, Minnesota Anchorage, Alaska Aniak, Alaska Crooked Creek, Alaska Grayling, Alaska Holy Cross, Alaska Red Devil, Alaska Shageluk, Alaska Fairbanks, Alaska Deering, Alaska Delta Junction, Alaska Fort Yukon, Alaska Kaktovik, Alaska Kivalina, Alaska Point Hope, Alaska Ruby, Alaska Shishmaref, Alaska Teller, Alaska Brevig Mission, Alaska
Other Plants for Zone 3A
Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Cilantro Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Leek Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Radish Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Mizuna Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Celosia Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree
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Growing Cosmos in USDA Zone 3A
Cosmos (Cosmos bipinnatus) grows well in USDA Hardiness Zone 3A. This zone includes cities like Embarrass, Soudan, Tower and 22 more.
The average last frost date for Zone 3A is around Monday, May 25, 2026. Cosmos can be directly sown outdoors around Monday, May 25, 2026.
Expect to harvest your Cosmos approximately 60 days after planting.