Planning path

Transplant Garden Planner

Plan seedling moves with hardening-off, frost timing, crop tolerance, root-ball handling, watering, protection, and catalog entries with transplant timing.

Transplant timing checks

Harden off seedlings

Move protected seedlings outdoors gradually before planting them into beds, containers, sun, wind, and fluctuating temperatures.

Match transplant timing

Use the catalog transplant offset from last frost, then confirm local frost risk, soil warmth, and crop tolerance before planting out.

Separate warm and cool crops

Handle cole crops and other cool-season seedlings differently from tender tomatoes, peppers, basil, cucumbers, squash, and melons.

Protect root balls

Keep seedlings from becoming root-bound, avoid burying peat-pot rims above the soil surface, and disturb roots as little as practical.

Water in and shelter

Water transplants into the root zone and use temporary protection when wind, sun, cold, or temperature swings would stress young plants.

Skip needless transplanting

Do not start every crop indoors; direct-sown crops can catch up when transplanting adds shock, root disturbance, or unnecessary tray work.

Regional transplant checks

Pair catalog transplant offsets with regional frost assumptions, soil temperature, hardening-off, and local transplant markers before moving seedlings outside.

• York County Pennsylvania Frost-Window Garden Penn State York County transplant windows for indoor-start, early/latest transplant, hardening, and maturity checks
• New Jersey Frost-Range Seed-Starting Garden Rutgers frost-range checks for cool-season transplant timing, warm-season soil readiness, and poor-transplanting crops
• Rhode Island Planting Calendar Vegetable Garden URI calendar checks for May 15/October 15 frost assumptions, hardening off, and S/T method markers
• Minnesota Soil-Temperature Vegetable Garden UMN soil-temperature checks for mid-to-late May warm transplants, freeze-date tools, and short-season crop fit

Transplant-capable seed candidates

• American Flag Leek Cool · transplant 14 days before last frost · 120 days
• Black Seeded Simpson Lettuce Cool · transplant 14 days before last frost · 45 days
• Early White Vienna Kohlrabi Cool · transplant 14 days before last frost · 55 days
• Georgia Southern Collards Cool · transplant 14 days before last frost · 65 days
• Golden Acre Cabbage Cool · transplant 14 days before last frost · 64 days
• Lacinato Kale Cool · transplant 14 days before last frost · 60 days
• Long Island Improved Brussels Sprouts Cool · transplant 14 days before last frost · 100 days
• Snowball Y Cauliflower Cool · transplant 14 days before last frost · 70 days
• Tall Maximum Snapdragon Cool · transplant 14 days before last frost · 100 days
• Waltham 29 Broccoli Cool · transplant 14 days before last frost · 74 days
• White Stem Bok Choy Cool · transplant 14 days before last frost · 45 days
• Green Curled Endive Cool · transplant 7 days before last frost · 85 days
• Evergreen Bunching Onion Shoulder · transplant 7 days before last frost · 65 days
• Common Chives Cool · transplant on last frost · 80 days
• Bright Lights Swiss Chard Shoulder · transplant on last frost · 55 days
• Italian Flat Leaf Parsley Shoulder · transplant on last frost · 75 days
• Sweet Alyssum Shoulder · transplant on last frost · 50 days
• California Giant Zinnia Warm · transplant 7 days after last frost · 75 days
• Common Lemon Balm Warm · transplant 7 days after last frost · 70 days
• Florence Fennel Warm · transplant 7 days after last frost · 80 days
• French Marigold Warm · transplant 7 days after last frost · 55 days
• Indian Summer Rudbeckia Warm · transplant 7 days after last frost · 90 days
• Tall Double Mix Strawflower Warm · transplant 7 days after last frost · 80 days
• Tall Utah Celery Cool · transplant 14 days after last frost · 110 days
• Common Thyme Shoulder · transplant 14 days after last frost · 90 days
• Arp Rosemary Warm · transplant 14 days after last frost · 120 days
• Broadleaf Sage Warm · transplant 14 days after last frost · 75 days
• Chief Mix Celosia Warm · transplant 14 days after last frost · 90 days
• Delicata Winter Squash Warm · transplant 14 days after last frost · 100 days
• Dense Blazing Star Warm · transplant 14 days after last frost · 365 days
• Eastern Bee Balm Warm · transplant 14 days after last frost · 365 days
• Genovese Basil Warm · transplant 14 days after last frost · 68 days
• Globe Amaranth Gomphrena Warm · transplant 14 days after last frost · 85 days
• Grandiflora Petunia Warm · transplant 14 days after last frost · 85 days
• Greek Oregano Warm · transplant 14 days after last frost · 90 days
• Green Globe Artichoke Warm · transplant 14 days after last frost · 120 days
• Hale's Best Jumbo Melon Warm · transplant 14 days after last frost · 85 days
• Joe Pye Weed Warm · transplant 14 days after last frost · 365 days
• Marketmore 76 Cucumber Warm · transplant 14 days after last frost · 58 days
• Munstead Lavender Warm · transplant 14 days after last frost · 90 days
• Purple Coneflower Warm · transplant 14 days after last frost · 365 days
• Red Stem Malabar Spinach Warm · transplant 14 days after last frost · 70 days
• Roma Tomato Warm · transplant 14 days after last frost · 76 days
• Small Sugar Pumpkin Warm · transplant 14 days after last frost · 100 days
• Sugar Baby Watermelon Warm · transplant 14 days after last frost · 80 days
• Tall Verbena Warm · transplant 14 days after last frost · 90 days
• Toma Verde Tomatillo Warm · transplant 14 days after last frost · 70 days
• Waltham Butternut Squash Warm · transplant 14 days after last frost · 95 days
• Black Beauty Eggplant Warm · transplant 21 days after last frost · 80 days
• California Wonder Pepper Warm · transplant 21 days after last frost · 72 days

Supporting planning paths

• Start Indoors Seeds 18 transplant-capable entries are marked start indoors
• Seed-Starting Tray Planner Size indoor starts before transplant timing arrives
• Hardening-Off Transplant Planner Plan acclimation before moving seedlings from trays into beds or containers
• Frost Protection and Season Extension Planner Plan temporary protection when transplant dates meet cold nights or wind
• Planting Calendar Tool Map transplant windows to last frost, first frost, and harvest estimates
• Container Garden Planner 43 transplant-capable entries also fit containers
• Fall Planting Planner 23 transplant-capable entries also have first-frost windows
• Warm Season Seeds 31 transplant-capable entries fit warm-season collections

32 transplant-capable entries are also Either start-method entries

Source basis

• Cornell tomato growing guide 1 entry cites this source
• CSU vegetable planting guide 10 entries cite this source
• Penn State cole crops for home vegetable gardens 5 entries cite this source
• Penn State Extension hardening transplants Hardening-off process for seedlings moving from protected conditions into outdoor sun, wind, and temperature swings
• Penn State plant factsheets 2 entries cite this source
• Penn State planting for pollinators 1 entry cites this source
• Penn State York County vegetable transplanting guide York County Pennsylvania Frost-Window Garden regional transplant source
• Rutgers NJAES Starting Vegetable Seeds Indoors New Jersey Frost-Range Seed-Starting Garden regional transplant source
• Seed Savers seed saving guide 10 entries cite this source
• UMN companion planting guide 2 entries cite this source
• UMN planting the vegetable garden 4 entries cite this source
• UMN starting seeds indoors 14 entries cite this source
• URI Cooperative Extension Rhode Island Planting Calendar Rhode Island Planting Calendar Vegetable Garden regional transplant source
• Xerces pollinator-friendly native plant lists 1 entry cites this source