So how does cycling work? 3 week race followed by a month off?
There are a mix of races. the big 3 grand tours are the Giro d'Italia, the Tour de France, and the Vuelta de Espana. These are the 3 week races. The are one week races, too, and one day races. late March and April is the Spring classic season in Italy, Belgium, and Netherlands, with 4 of the biggest races of the year (Tour of Flanders and Paris-Nice, which are over coutnry roads and some cobblestone paths), Milan - San Remo (the longest 1 day race at 150+ miles), and a race through the Ardennes (Liege - Bastogne - Liege).
Between the Giro and the Tour there are several week long races that sort of preview some of the tour course and that are used to train for the Tour. They are big by themselves - Tour of Switzerland and the Criterium Dauphine. The winner of the Dauphine often has won the Tour.
The biggest American races are a 1 week race in May, the Tour of California, and a 1 week race in August, the US Pro Cycling Classic. There are different levels of teams and races. The biggest races are in the World Pro Tour with the big budget teams, and below that are Professional Continental and lower levels.
Next weekend, there are lower level races in Clarendon and Crystal city. These are the Air Force Cycling classic races and feature second tier teams. There are also chances for the public to ride an extended course on Sunday out of Crystal City that does loops over the Air force Monument hill. there are prizes depending on how many laps you do.