| + 10-10 Int. Spring Contest, CW | 0001Z, May 1 to 2359Z, May 2 | http://www.ten-ten.org/index.php/activity/2013-07-22-20-26-48/qso-party-rules |
| + RCC Cup | 0300Z-0859Z, May 1 | http://rcccup.ru/ |
| + ARI International DX Contest | 1200Z, May 1 to 1159Z, May 2 | http://www.ari.it/ |
| + AGCW QRP/QRP Party | 1300Z-1900Z, May 1 | http://alt.agcw.de/index.php/en/contests-and-cw-activities/qrp-qrp-party |
| + 7th Call Area QSO Party | 1300Z, May 1 to 0700Z, May 2 | http://7qp.org/ |
| + Indiana QSO Party | 1500Z, May 1 to 0300Z, May 2 | http://www.hdxcc.org/inqp/rules.html |
| + Delaware QSO Party | 1700Z, May 1 to 2359Z, May 2 | http://www.fsarc.org/qsoparty/rules.htm |
| + New England QSO Party | 2000Z, May 1 to 2359Z, May 2 | https://neqp.org/rules/ |
| + ARS Spartan Sprint | 0100Z-0300Z, May 4 | http://arsqrp.blogspot.com/2009/02/so-whats-spartan-sprint-and-how-do-i.html |
| + MIE 33 Contest | 2300Z, May 4 to 0300Z, May 5 | http://www.ztv.ne.jp/isoda/33/annual/43/43rule-e.html |
| + CQ-M International DX Contest | 1200Z, May 8 to 1159Z, May 9 | http://cqm.srr.ru/en-rules/ |
| + SKCC Weekend Sprintathon | 1200Z, May 8 to 2359Z, May 9 | http://www.skccgroup.com/operating_activities/weekend_sprintathon/ |
| + VOLTA WW RTTY Contest | 1200Z, May 8 to 1200Z, May 9 | http://www.contestvolta.com/rules.pdf |
| + Arkansas QSO Party | 1400Z, May 8 to 0200Z, May 9 | http://www.arkqp.com/ |
| + 4 States QRP Group Second Sunday Sprint | 0000Z-0200Z, May 10 | http://www.4sqrp.com/SSS/sss_rules.pdf |
| + NZART Sangster Shield Contest | 0800Z, May 15 to 1100Z, May 16 | https://www.nzart.org.nz/activities/contests/sangster-shield |
| + His Maj. King of Spain Contest, CW | 1200Z, May 15 to 1200Z, May 16 | http://concursos.ure.es/en/s-m-el-rey-de-espana-cw/bases/ |
| + Run for the Bacon QRP Contest | 2300Z, May 16 to 0100Z, May 17 | http://qrpcontest.com/pigrun/ |
| + Baltic Contest | 2100Z, May 22 to 0200Z, May 23 | http://www.lrsf.lt/en/balticcontestrules/ |
| + QRP ARCI Hootowl Sprint | 0000Z-0100Z, May 24 | http://qrparci.org/contest/hoot-owl-sprint |
| + SKCC Sprint | 0000Z-0200Z, May 26 | http://www.skccgroup.com/operating_activities/weekday_sprint/ |
| + CQ WW WPX Contest, CW | 0000Z, May 29 to 2359Z, May 30 | http://www.cqwpx.com/rules.htm |