The Season of Creation spans five weeks between the World Day of Prayer for the Care of Creation (September 1) and the Feast Day of St. Francis of Assisi (October 4). This “time for creation” offers, in the words of Pope Francis:
Individual believers and communities a fitting opportunity to reaffirm their personal vocation to be stewards of creation, to thank God for the wonderful handiwork which he has entrusted to our care, and to implore his help for the protection of creation as well as his pardon for the sins committed against the world in which we live.
Please take a look at the below material provided by the US Conference of Catholic Bishops: