The feast will be March 20 this year, since the 19th is a Sunday
The St. Joseph novena can be started today, March 11, as the feast day will be moved this year.
This prayer from the Pope is only three paragraphs long, and makes a great way to pray the novena:
You can also use this Novena, from 2021, the year of St. Joseph:
Find all nine days here.
