Probably earlier, if absentee balloting is allowed. Is it in NH and Iowa?
The early voting seems to keep changing. Here’s what Wiki says at the moment:
Dates
Republican candidates in the 2008 U.S. presidential election will campaign for the nomination from their party. The tentative timeline is as follows, with the number of delegates awarded for each state in parentheses:
Phase One: Early Primaries and Caucuses
Thursday, January 3, 2008 - Iowa (41)
Saturday, January 5, 2008 - Wyoming (12 of 28)