From the USHGA website, I have gleaned the following Competition Schedule for the 2009 season:
The website addresses are correct - They may not be up yet, however.
Sierra National Challenge-US PG Nationals (Dunlap, CA)
4/26/2009 through 5/3/2009
West Coast Paragliding Championships (Woodrat, OR)
5/31/2009 through 6/6/2009
Rat Race Paragliding Competition (Woodrat, OR)
6/28/2009 through 7/4/2009
US Paragliding Nationals (Squaw Peak, UT)
8/16/2009 through 8/22/2009
The first and last meets of the year, (Dunlap, CA and Squaw Pk., UT) will comprise the "US Nationals." Their scores will be combined (with a throw-away option) to determine the US Champion.