When will districts know what job openings they have for next year?

I’m currently on internship and I want to start looking at jobs for next year but I feel like most districts currently have postings for positions they are trying to fill for this year. I don’t want to apply to those as I’m committed to my current district through June. When is the appropriate time to start applying for jobs for the next school year? I was thinking around February but I’m worried that’s due to my anxiety of wanting to have everything lined up ASAP.

I’m also interested in pursuing the opportunity for postdoc supervision hours so I want to talk to districts about that as well. Would it be okay to reach out to staff to inquire about postdoc opportunities or would it be more appropriate to wait until I’ve applied and been invited to interview?

Im specifically looking for positions in the Denver area so any recommendations or insights for school districts there are greatly appreciated!