The Kansas independent candidate petition is noon on August 6. The independent candidate petition for Jill Stein was submitted on the afternoon of August 6, but the Secretary of State rejected the petition because it was filed a few hours after noon.
However, it is probable that the petition didn’t have enough valid signatures anyway. The law requires 5,000, but the petition only had 5,520 signatures. All the signatures were gathered in the week before the deadline. The party couldn’t get started sooner because it took time to find a list of candidates for presidential elector.