January
Winter Field Day
Winter Field Day is held on the last full weekend of January.
February
Hamcation
HamCation is large hamfest held in Orlando, Florida. They promote themselves as the second largest amateur radio annual event.
March
April
Ohio ARES NVIS Day
The Ohio Amateur Radio Emergency Service (ARES) Near-Vertical Incidence Skywave (NVIS) Day is an opportunity to practice local communications using HF frequencies below the Maximum Usable Frequency (MUF). The exercise will run from 10:00 to 16:00 local time.
May
Armed Forces Day Crossband Test
Armed Forces Day is on the 3rd Saturday in May. Military radio stations will transmit on military frequencies and listen on amateur radio frequencies. Stations, times, and frequencies can be found here.
Hamvention
The Hamvention in Dayton, Ohio is the largest amateur radio annual event.
June
MUSEUM SHIPS ON THE AIR
This event is organized by the Battleship New Jersey Amateur Radio Station and is held annually on the first weekend in June. Hams operate aboard museum ships all over the world to make contact with other amateur radio stations.
Field Day
The annual ARRL Field Day is held on the fourth full weekend of June all day Saturday and Sunday.
July
Parks on the Air
The summer POTA Support Your Parks weekend is also the annual POTA plaque event and is held on the third full weekend in July.
August
Ohio QSO Party
The Ohio State Parks on the Air (OSPOTA) is held annually on the first Saturday following Labor Day.
September
Ohio State Parks on the Air
The Ohio State Parks on the Air (OSPOTA) is held annually on the first Saturday following Labor Day.
October
Boy Scouts Jamboree on the Air
Jamboree-on-the-Air, or JOTA, is held the third weekend in October and is the largest Scouting event in the world. There are no official hours, so you have the whole weekend to make JOTA contacts. The event officially starts Friday evening during the JOTA Jump Start and runs through Sunday evening. Scouts of any age can participate, from Cub Scouts to Boy Scouts and Venturers, including girls.