California is actually a great spot for karting in the country right now. It is the heartland of SKUSA, which is currently our largest series and the closest thing we have to a true “national” championship, which is the SKUSA Pro Tour. It has 3 races across the country along with the SuperNationals in Las Vegas, Nevada, each year.
Also in California is the SKUSA California ProKart Challenge, which is SKUSA’s largest regional program. Most of the clubs run the same class structure and tire as SKUSA now and the regional series in California is on-par with the other series in the country (USPKS, WKA Manufacturers Cup) in terms of competition – the Top 10 in ProKart are Top 20 in Pro Tour. 25-30 kart fields.
All of the series I’ve listed are X30. IAME has a stronghold in the country, Rok is gaining some ground, and Rotax is losing some ground.