Try to ensure a gap of at least
0.99 inches (2.54 cm) when sowing to prevent overcrowding your seedlings.
By our calculations, you should look at sowing 922.11 Cutting Celery about 91 days before your last frost date.
As 922.11 Cutting Celery is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.