• Check http://www.arrl.org/contest-calendar
    • Check the dates listed on the page
    • Check also the Contest Corral link

The big weekends to avoid are:

  • Phone (SSB and other modes)
    • March
      • 1st full weekend in March (All Sat+Sun UTC) - ARRL DX (Phone)
      • Last weekend in March (All Sat+Sun UTC) - CQ WPX (Phone)
    • June
      • 4th full weekend in June (1800 Saturday to 2100 Sunday UTC) - Field Day
    • July
      • 2nd full weekend in July (1200 Saturday to 1200 Sunday UTC) - IARU Radio Sport
    • October
      • 4th or 5th weekend in October - CQWW - http://www.cqww.com/
    • November
      • 3rd full weekend in November (2100 Saturday to 0300 Monday UTC) - Sweepstakes
  • CW
    • February
      • 3rd full weekend in February (All Sat+Sun UTC) - ARRL DX (CW)
    • May
      • Last weekend in May (All Sat+Sun UTC) - CQ WPX (CW)
    • June
      • 4th full weekend in June (1800 Saturday to 2100 Sunday UTC) - Field Day
    • October
      • 4th or 5th weekend in October - CQWW - http://www.cqww.com/
    • November
      • 1st full weekend in November (2100 Saturday to 0300 Monday UTC) - Sweepstakes

CW and SSB all run on different weekends. Use the mode not in play for the contest that weekend or use the WARC bands.