Similar situation in that by the time I realized my son needed acceleration, the application deadline was 11 months past. Yep. That particular elementary school parents have to apply by Feb 15 for the following school year.

The school he's in now (same district) is 100% flexible about subject acceleration. He subject accelerated from 1st to 6th+ grade in 2 years. The district superintendent had to approve the official skip from 4th to 7th - which took only 1 meeting between his school's director and the district superintendent. The school is still allowing subject acceleration beyond that.

2 schools in the same district - radically different timelines for acceleration process.