Not sure about the tracks you run at, but most will not pass you through tech with anything other than straight water. Antifreeze is slippery, and it don't dry up too quick.
None of the tracks I've ever gone to has checked to see what color my coolant is, but they don't allow antifreeze. I run water during the warmer months and then in the winter I drain the water and put in antifreeze, then run the motor for a little while to get it to circulate. Then I leave it in the garage until it's warm again.
But I'm not doing that anymore... When it starts getting cold out I'll drain the radiator and the block and leave it in the garage dry.