Cold Winter Areas
Zones: 1–7a
These zones experience cold winters with extended periods of freezing temperatures. In March, monitor soil conditions, thaw cycles, and late frosts as you prepare for early outdoor sowing. Indoors, this is a busy month for starting cool-season crops and hardy flowers under lights or in a greenhouse so they are ready to transplant as soon as the weather warms.
Indoors (fresh harvests):
- Microgreens: peas, broccoli, sunflowers, arugula.
- Sprouts: alfalfa, broccoli, radish, mung
- Herbs & greens under lights: chives, parsley, mint
Crops to start indoors in good light: bunching onion, eggplant, tomato, pepper, zinnia, basil, Swiss chard, cosmos
Transplants to move outdoors (weather permitting - harden first): Onion, parsley, broccoli, cabbage, kohlrabi, arugula, pansy, viola
Crops that can be directly sown outdoors in March (assume intermittent frosts; a low tunnel or row cover makes most of these reliable): pak choi, cabbage, kale, mustard, fava bean, pea, turnip, parsnip, sweet pea
Cover crops: winter rye, fava bean, hairy vetch, red or white clover, and cover crop mixes.
Tip: This zone group covers a lot of territory. Nothing takes the place of talking with experienced gardeners in your area and, of course, watching the weather closely.
Use your USDA zone as a guide. Microclimates matter—coastal/urban spots run warmer; high elevation runs colder. 7b pockets can follow “Mild” recommendations with protection.
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![Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites]()
Asparagus Seeds - UC 157 F1
Second season harvest. Asparagus officinalis. UC 157 F1 Asparagus Seeds. Non-GMO, perennial, F1 hybrid. This crop is suitable for garden plots, raised beds, and fields. Classic UC Riverside hybrid known...
Chinese Cabbage Seeds - Kyoto No. 3
Chinese Cabbage Seeds - Kyoto No. 3. Heirloom, Non-GMO. Brassica rapa Pekinensis group. 80 days. Cool season annual. A Japanese heirloom or dento yasai variety of Japan, this cabbage has...
Lettuce Seeds - Red Iceberg (Organic)
55-65 Days to maturity. Lactuca sativa. Organic Red Iceberg Lettuce Seeds. Non-GMO, annual, organic, open-pollinated, heirloom. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. Red Iceberg...
Zinnia Seeds - Cut and Come Again (Organic)
60-70 Days to Maturity. Zinnia elegans. Organic Cut and Come Again Zinnia Flower Seeds. Non-GMO, organic, heirloom, open-pollinated flowers. Annual in zones 3, 4, 5, 6, 7, 8, 9, and...
Squash Seeds - Winter - Green Hubbard
Plant non-GMO, heirloom Green Hubbard Squash Seeds from True Leaf Market to enjoy sweet-tasting winter squash that weighs up to 12 lbs. A great variety for winter storage, the Green...
Squash Seeds - Winter - Gold Nugget
Gold Nugget Winter Squash Seeds. 95 Days to maturity. Non-GMO, heirloom, open pollinated squash seeds. Cucurbita maxima. AKA: Golden Nugget Squash, Oriental Pumpkin. Originally bred as a replacement for sweet...
Onion Seeds - Bunching - Tokyo Long White (Organic)
60-90 Days to maturity. Allium fistulosum. Organic Tokyo Long White Onion Seeds. Non-GMO, perennial, organic, open-pollinated, heirloom, cold tolerant, drought tolerant, bunching onion. Suitable for growing in greenhouses, garden plots,...
Watermelon Seeds - Giant - Florida Giant
90 Days to maturity. Citrullus lanatus. Florida Giant Watermelon Seeds. Non-GMO, annual, open-pollinated, heirloom, heat tolerant, seeded, giant watermelon. The Florida Giant watermelon, AKA: Cannon Ball Watermelon, was developed in...
Pepper Seeds - Sweet - Golden Treasure Hybrid
65-80 Days to maturity (from transplant). Capsicum annuum. Golden Treasure Hybrid Pepper Seeds. Non-GMO, annual, F1 hybrid, sweet pepper with no heat. 0 Scoville Heat Units. Suitable for growing in...
Eggplant Seeds - Fingers - Green
Fingers Green Eggplant Seeds. Solanum melongena. 70 days to maturity. Open Pollinated, Annual. Can be grown in containers. The plant produces light green fruits that are thin and tender. About...
Melon Seeds - Cantaloupe - Ball 2076 Hybrid
85 Days to maturity. Cucumis melo. Ball 2076 Hybrid Cantaloupe Melon Seeds. A non-GMO, annual, hybrid, heat-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds, and greenhouses. Resistant...
Onion Seeds - Short - Crystal White Wax
95 Days to maturity. Allium cepa. Crystal White Wax Onion Seeds. Non-GMO, annual, perennial, organic, hybrid, open-pollinated, heirloom, AAS winner, heat tolerant, cold tolerant, drought tolerant, bulbing, bunching, short-day onion....
Basil Seeds - Lime
Non-GMO, Heirloom Lime Basil Herb Seed from True Leaf Market. Ocimum americanum. As basil has many different types, Lime Basil is a sweet cultivar that grows round bright-green leaves with...
Lettuce Seeds - Spring Mix - Organic
40-70 Days to maturity. Lactuca sativa. Organic Spring Mix Lettuce Seeds. The Spring Lettuce Mix is a blend of lettuces chosen especially for Spring planting. They offer a good range...
Bean Seeds - Bush - Red Chili (Organic)
75-100 Days to maturity. Phaseolus vulgaris. Red Chili Bean Seeds (Organic). Non-GMO, annual, open-pollinated, organic, heirloom, bush, shelling bean. Suitable for growing in containers, garden plots, raised beds, and greenhouses....
Tomato Seeds - Salad - Indigo Rose
75-80 Days to maturity (from transplant). Solanum lycopersicum. Indigo Rose Tomato Seeds (PVP 201100302). Non-GMO, annual, open-pollinated, heirloom, indeterminate, salad tomato. Suitable for growing in garden plots, raised beds, and...
Lettuce Seeds, Romaine - Vivian - Organic
Organic Vivian Romaine Lettuce Seeds. 50 days to full maturity. 28 days to maturity for baby leaves. Lactuca sativa. Open Pollinated. Non-GMO. Annual. Approx. 25,000 Seeds per ounce. Download Free...
Melon Seeds - Cantaloupe - Tuscany
78 Days to maturity. Cucumis melo. Tuscany Cantaloupe Melon Seeds. A non-GMO, annual, open-pollinated, heirloom, heat-tolerant Cantaloupe Melon. Suitable for growing in garden plots, raised beds, and greenhouses. The Tuscany...
Pak Choi Seeds - Savoy Tatsoi
45 Days to maturity, 10-15 days for microgreens, and 20-30 days for baby leaf. Brassica rapa var. narinosa. Savoy Tatsoi Pak Choi Seeds. Cool-Warm Season Annual Heirloom. This dark green,...
Mustard - Wasabi (Organic)
Wasabi Mustard Seeds. Certified Organic by Oregon Tilth. Non-GMO. 45 days. This mustard has large green leaves with wavy edges and a fun wasabi-like bite. Easy to grow in your...
Myosotis (Forget-Me-Not) Seeds - Sylvatica
2nd Year Maturity. Forget-Me-Not sylvatica seeds promise an authentic and biennial touch of the United Kingdom in your garden. Myosotis sylvatica seeds grow herbaceous 9-12" tall dwarfed branching shrubs bursting...
Penstemon Seeds - Rocky Mountain
120 Days to maturity. Penstemon strictus. Rocky Mountain Penstemon Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, perennial. Rocky Mountain penstemon is easy to grow from seed and ideal for gardens prone...
Tomato Seeds - Slicing - Floradade
74 Days to maturity (from transplant). Solanum lycoperscium. Floradade Tomato Seeds. Non-GMO, annual, open-pollinated, heirloom, determinate, heat tolerant, slicing tomato. Suitable for growing in garden plots, raised beds, and greenhouses....
Pansy Seeds - Swiss Giant Mixture
91-98 Days to maturity. Viola x wittrockiana. Swiss Giant Mixture Pansy Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, annual. Swiss Giant Mix pansy seeds grow a compact yet nevertheless dazzling alternative...
Pumpkin Seeds - Kentucky Field
Cucurbita moschata (113 days) Kentucky Field Pumpkin Seeds. Fruits can be variable in shape, normally deeper/longer than they are wide. Kentucky Field generally weights between 10-15 pounds. The skin is...
China Aster Seeds - Colour Carpet Mix
60-90 Days to maturity. Callistephus chinensis. Colour Carpet China Aster Seeds. Non-GMO, ornamental, annual, open-pollinated flower. Colour Carpet China Aster flower garden seeds grow an adorable dwarfed aster plant ideal...
Cucumber Seeds - Painted Serpent (Organic)
63 Days to maturity. Cucumis melo. Organic Painted Serpent Cucumber Seeds. Non-GMO, annual, organic, open-pollinated, heirloom, monoecious, slicing cucumber. Suitable for growing in fields, containers (with support), garden plots, raised...
Squash Seeds - Ebony Acorn
Cucurbita pepo (90 days) Ebony Acorn is a delicious dark acorn-type squash that is early and second only in flavor to Hubbard. Prolific 8' vines produce 1.5-2 pound fruits that...
Tomato Seeds - Slicing - Great White
80 Days to maturity (from transplant). Solanum lycopersicum. Great White Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds, and...
Lettuce Seeds - Salad Leaf Blend
Just plant it and start making your instant salads today. Lettuce Seeds - Salad Leaf Blend You have been asking for it! So here it is, an instant salad mix...
Cucumber Seeds - Summer Dance - Hybrid
55-70 Days to maturity. Cucumis sativus ‘Summer Dance’. Summer Dance Cucumber Seeds. Warm-season annual hybrid. Non-GMO. Best known for its extremely uniform fruit, this hybrid grows vigorously and delivers a...
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