Strawberries (perennial fruit) is classed hardy perennial in the cited extension guidance. The timing rules below are relative to your local freeze dates — enter a location to turn them into calendar dates.
The rules this site applies
Method
Frost-relative window
Rule & reconciliation
Transplant outdoors
(plant dormant crowns)
4–2 weeks before the median last spring freeze
NC State: plant 1-year-old dormant plants about three or four weeks before the average last frost. Utah State: dormant bare-root plants need not wait for frost danger to pass. Span extended to 14 days.
No direct-sow outdoors window: Garden strawberries are planted as crowns/plants, not seed.
Variety assumption: June-bearing beds fruit the year AFTER planting (blossoms are usually removed the first season).
"Bare root dormant plants are transplanted in early spring. Since the plants are dormant, there is no need to wait until after the risk of spring frost has passed."