SproutSmart
SproutSmart Intelligent Garden Sowing

Ailsa Craig · Onion

Zone 3a Save Garden

Planting Schedule

Add Ailsa Craig to your garden to build a schedule and get reminders.
MilestoneDate
Start IndoorsDirect Sow
Last FrostMay 15th
Transplant / Direct Sow OutdoorsMay 8th
Harvest BeginsAug 11th
Harvest EndsSep 1st

Crop Details

Transplant Conditions: Wait until soil reaches 45°F and nights stay above 35°F before moving outdoors.
TraitValue
Days to Maturity95
Sun RequirementsFull Sun
Growth HabitBulbing
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)45
Min Night Temp (°F)35
Harden Off (days)Not Required
Expert Note: Start with clean, well-drained soil and transplant into consistently cool conditions; Ailsa Craig performs best when it has steady growth before bulbing and is harvested before extended wet fall weather reduces shelf life.