Copied from the PA Department of State listing. Download the pdf here.

2020 PENNSYLVANIA ELECTIONS IMPORTANT DATES TO REMEMBER

First day to circulate and file nomination petitions …………………………………….January 28
Last day to circulate and file nomination petitions ……………………………………..February 18
First day to circulate and file nomination papers ………………………………………..February 19
Last day for withdrawal by candidates who filed nomination petitions ………….March 4
Last day to REGISTER before the primary ……………………………………………….April 13
Last day to apply for a mail-in or civilian absentee ballot ……………………………April 21
Last day for County Boards of Elections to receive voted mail-in and
civilian absentee ballots (must be received by 8:00 P.M.) ……………………………April 28
GENERAL PRIMARY …………………………………………………………………………April 28
First day to REGISTER after primary ……………………………………………………….April 29
Last day for County Boards of Elections to receive voted military and
overseas absentee ballots (submitted for delivery no later than
11:59 P.M. on April 27) ……………………………………………………..May 5
Last day to circulate and file nomination papers …………………………………………August 3
Last day for withdrawal by candidates nominated by nomination papers ………August 10
Last day for withdrawal by candidates nominated at the primary …………………August 10
Last day to REGISTER before the November election ……………………………….October 19
Last day to apply for a mail-in or civilian absentee ballot ……………………………October 27
Last day for County Boards of Elections to receive voted mail-in and
civilian absentee ballots (must be received by 8:00 P.M.) ……………………………November 3
GENERAL ELECTION …………………………………………………………….November 3
First day to REGISTER after November election ……………………………………….November 4
Last day for County Boards of Elections to receive voted military and
overseas absentee ballots (submitted for delivery no later than
11:59 P.M. on November 2) ……………………………………November 10

Note: All dates in this calendar are subject to change without notice