The Republican Party convention starts July 18 and is supposed to end July 21, although it is possible the convention won't finish in time and must extend itself.

If Trump does nothing to get himself on the November ballot outside the Republican Party until July 21, he would have already missed these petition deadlines:  Georgia (July 12), Illinois (June 27), Indiana (June 30), Michigan (July 21), Missouri (July 25), New Mexico (June 30), North Carolina (June 9), Oklahoma (July 15), South Carolina (July 15), Texas (May 9 for an independent presidential candidate, May 23 for a new party). States not named above have August or September deadlines, for at least one method to get on the ballot (indp or new party).