Registration deadlines for the following contests are listed in the Fall 2019 issue of the Study of Exceptional Talent Precollege Newsletter

Oct 08 Harvard MIT Math Tournament

Oct 10 Quill and Scroll Yearbook Excellence Contest

Oct 11 Young Arts

Oct 15 Math Olympiads for Elementary and Middle Schools

Oct 29 American Mathematics Contest 8

Oct 31 Future City Competition

Nov 03 Conrad Challenge

Nov 06 High School Mathematical Contest in Modeling

Nov 13 Regeneron Science Talent Search

Nov 16 Prudential Spirit Of Community Awards

Nov 19 FIRST Robotics Competition

Dec 01 ACSL Programming contest

Dec 01 River of Words Poetry and Art Contest

Dec 04 USA physics olympiad


??? USA Computing Olympiad (first contest is in December, register to get on mailing list -- added by me)