The earliest this can be done is during the Waverider Cup - High Fliers Hot Lap race.
I got this during the World Cup - Big Fish Freestyle race. Recommend that you save your boost until the end of the track. There will be a huge ramp, press
to use your boost. I don't believe that doing a trick is necessary, but I did a double front flip to give me some extra distance. Using your boost before hitting the ramp should give you enough speed to shoot you over 200m.
You'll come across this specific track (different names) throughout the next 4 cups.