Planning path

Cool Season Garden Planner

Plan cool-season crops from local frost dates, soil temperature, spring and fall windows, heat risk, crop tolerance, and source-backed catalog entries.

Cool-season timing checks

Use frost dates, not a fixed calendar

Anchor spring and fall planting to local last-frost and first-frost dates, then adjust for the crop tolerance listed in the catalog.

Check soil temperature

Cool-season crops can handle cooler air, but germination and stand quality still depend on soil warmth, seed depth, and even moisture.

Plan for spring and fall

Use early spring for hardy crops, then use midsummer and late-summer sowing only where days to maturity and first-frost timing still fit.

Watch heat and bolting

Move heat-sensitive greens, roots, and cole crops away from hot windows that can trigger bolting, bitterness, poor heads, or low harvest quality.

Separate direct sowing and transplanting

Direct sow peas, roots, greens, and cover crops where timing fits; use transplants for cool crops that need a head start or more controlled spacing.

Protect quality in cold snaps

Use row cover, mulch, or temporary protection when sudden cold, wind, or freeze-thaw swings would reduce stand quality or damage young plants.

Regional cool-season checks

Pair cool-season catalog entries with regional soil temperature, frost tolerance, spring/fall windows, and short-season quality limits

• Minnesota Soil-Temperature Vegetable Garden UMN checks for 40-50F direct seeding, freeze-date timing, and repeat lettuce/radish/kohlrabi windows
• Vermont Frost-Relative Vegetable Garden UVM checks for very-hardy and frost-tolerant groups, frost-free-date offsets, and late-August cool sowing
• South Carolina Spring and Fall Garden Clemson checks for Coastal and Piedmont spring/fall cool-crop chart rows, freeze timing, and radish harvest-day spacing
• Colorado High-Elevation Mountain Vegetable Garden CSU mountain checks for frost-tolerant cool crops, least-days-to-harvest choices, and two-week succession in one cool season

Cool-season seed candidates

• Long Island Improved Brussels Sprouts 100 days · Start indoors · 16 weeks before first frost
• American Flag Leek 120 days · Start indoors · 14 weeks before first frost
• Golden Acre Cabbage 64 days · Either · 12 weeks before first frost
• Snowball Y Cauliflower 70 days · Start indoors · 12 weeks before first frost
• Waltham 29 Broccoli 74 days · Either · 12 weeks before first frost
• American Purple Top Rutabaga 90 days · Direct sow · 12 weeks before first frost
• Early White Vienna Kohlrabi 55 days · Either · 10 weeks before first frost
• Lacinato Kale 60 days · Either · 10 weeks before first frost
• Sugar Snap Pea 62 days · Direct sow · 10 weeks before first frost
• Georgia Southern Collards 65 days · Either · 10 weeks before first frost
• Spencer Mix Sweet Pea 75 days · Direct sow · 10 weeks before first frost
• Common Chives 80 days · Either · 10 weeks before first frost
• Green Curled Endive 85 days · Either · 10 weeks before first frost
• Tall Maximum Snapdragon 100 days · Start indoors · 10 weeks before first frost
• Giant Imperial Larkspur 110 days · Direct sow · 10 weeks before first frost
• Detroit Dark Red Beet 58 days · Direct sow · 9 weeks before first frost
• Bloomsdale Spinach 42 days · Direct sow · 8 weeks before first frost
• Black Seeded Simpson Lettuce 45 days · Either · 8 weeks before first frost
• Southern Giant Curled Mustard 45 days · Direct sow · 8 weeks before first frost
• White Stem Bok Choy 45 days · Either · 8 weeks before first frost
• Yellow Mustard Cover Crop 45 days · Direct sow · 8 weeks before first frost
• Vit Mache Corn Salad 50 days · Direct sow · 8 weeks before first frost
• Purple Top White Globe Turnip 55 days · Direct sow · 8 weeks before first frost
• Annual Ryegrass Cover Crop 60 days · Direct sow · 8 weeks before first frost
• Berseem Clover Cover Crop 60 days · Direct sow · 8 weeks before first frost
• Field Pea Cover Crop 60 days · Direct sow · 8 weeks before first frost
• Minowase Daikon Radish 60 days · Direct sow · 8 weeks before first frost
• Pacific Beauty Calendula 60 days · Direct sow · 8 weeks before first frost
• Spring Oats Cover Crop 60 days · Direct sow · 8 weeks before first frost
• Blue Boy Bachelor's Button 65 days · Direct sow · 8 weeks before first frost
• Hairy Vetch Cover Crop 180 days · Direct sow · 8 weeks before first frost
• Santo Cilantro 50 days · Direct sow · 7 weeks before first frost
• Oilseed Radish Cover Crop 60 days · Direct sow · 7 weeks before first frost
• French Breakfast Radish 28 days · Direct sow · 6 weeks before first frost
• Astro Arugula 35 days · Direct sow · 6 weeks before first frost
• Winter Rye Cover Crop 180 days · Direct sow · 6 weeks before first frost
• Tall Utah Celery 110 days · Start indoors · spring timing only
• Hollow Crown Parsnip 120 days · Direct sow · spring timing only

Supporting planning paths

• Cool Season Seeds 38 catalog entries tagged cool season
• Fall Planting Planner 36 cool-season entries also have first-frost windows
• Direct Sow Garden Planner 33 cool-season entries can be direct sown
• Transplant Garden Planner 14 cool-season entries can be transplanted
• Quick Harvest Garden Planner 20 cool-season entries mature in 60 days or less
• Soil-Temperature Germination Planner Check cool-soil germination ranges before treating cool-season air tolerance as enough
• Frost Protection and Season Extension Planner Plan row cover, mulch, and temporary protection when cool-season beds meet frost, wind, or freeze-thaw swings
• Planting Calendar Tool Map cool-season spring and fall windows to local frost dates

Source basis

• Clemson Extension planning a garden South Carolina Spring and Fall Garden regional cool-season source
• CSU Extension vegetable gardening in the mountains Colorado High-Elevation Mountain Vegetable Garden regional cool-season source
• CSU vegetable planting guide 10 entries cite this source
• Penn State cole crops for home vegetable gardens 5 entries cite this source
• Seed Savers seed saving guide 5 entries cite this source
• UMN Extension growing cool-season crops Cool-season quality, bolting, bitterness, temperature stress, tolerant varieties, mulch, and spring/fall risk guidance
• UMN Extension midsummer planting for fall harvest First-frost timing, fall cool-season crop hardiness, succession planting, and second-crop bed preparation
• UMN planting the vegetable garden 7 entries cite this source
• UMN starting seeds indoors 3 entries cite this source
• UVM Extension Master Gardener Planting the Garden Vermont Frost-Relative Vegetable Garden regional cool-season source
• Wisconsin Extension cover crops and green manures 8 entries cite this source