Chloe Iliff, Alex Cotter (pictured) and William Bell competed in the event on Monday (November 20th) and will now represent Corby, Kettering and Oundle in the next stage of the championships at county level.
Chloe, who is a middle distance runner for Corby Athletic Club, came 5th out of 57 in the 2,400-metre race.
William was competing in a cross country run for the first time and he came 8th out of around 50 other runners.
He said: "At the beginning I thought I'd wasted all my energy at the start of the race but then I just came through.
"I think it will be more challenging to run at county level and a lot more difficult."
Alex, who is also a member of Corby Athletic Club, was also trying something new as he is normally as sprinter but he managed to come 17th in his group.
CBA's Director of Sport, Amy Harris, said: "Well done to all three runners who will now represent CBA at county level."