Every 2027 race weekend that touches Southern California, in one list, so you can see the overlaps before you commit to a series.
Dates from each organizer’s 2027 announcements as of Sept 30, 2026. TBA = venue not announced. The shadowed ones are the big weekends. “(east)” rounds are COTF East, listed so the national calendar is complete; nobody from here is flying to Cincinnati for a club-level kid.
The overlaps
- Jul 30–Aug 1 is the collision. COTF West R3 in Utah, COTF Club R6 at K1 and Tri-C Club R6 at Adams all land on the same weekend. If you are doing COTF America you miss a club round of whichever club you run. Plan the drop round here.
- Apr 2–4 and Sep 3–5: COTF East rounds sit on top of Tri-C Apex rounds. Irrelevant unless you are chasing the national (East + West) title.
- Back-to-back stretches: Feb 19–21 (COTF West R1) then Feb 28 (COTF Club R2): two K1 weekends in ten days. May 15 (Club R5), May 22–23 (PKC R3), May 28–30 (COTF Sonoma): three straight weekends, one of them a 7-hour drive. Sep 17–19 (COTF Spring Mountain), Sep 25 (Club R8), Oct 2–3 (Tri-C Apex), Oct 9–10 (PKC R6): four in a row.
- What does not conflict: COTF Club (K1, one-day) and Tri-C (Adams/Apex, two-day) alternate almost perfectly all year. You can run both clubs and only lose one weekend (Jul 30–Aug 1).
Not on the grid yet
- ROK Cup USA: West Coast rounds have been Sonoma and Las Vegas; 2027 dates not posted.
- Challenge of the Americas (Rotax): K1 in February in 2026, then AZ, CO, Sonoma; 2027 not posted.
- AMP So Cal Sprinters and AMP Winter League (Adams): the 2027 summer league is posted: eight Saturdays from Feb 20 to Sep 18, three of them at night (all on the calendar). The winter league is three one-day rounds: Dec 5, Dec 19 and Jan 9 this winter, and provisionally Dec 4, Dec 18 and Jan 8 for 2027–28.
- Tri-C Chill Challenge / High Desert / California Nights / Sagebrush: the 2027 sub-series beyond the club rounds above are not posted.
- FKL, Podium TKC, K1 Semi-Pro (arrive-and-drive): monthly or by season; see each series guide.
Which series in 2027?
This is the brake point of the year, and the one we are in the middle of ourselves. What follows is how we are thinking about it, not advice.
Tri-C (club, two-day weekends, Adams and Apex)
For: eight rounds an hour from home, big kid fields, real officiating, the cheapest way to race a season. Against: two-day weekends eat Saturdays, and Adams and Apex are not K1. Costs: entry $225 + $20 transponder + $20 pit pass per round (member pre-entry is cheaper), plus whatever your team charges.
COTF Club (club, one-day, K1)
For: one-day rounds at the best track in SoCal, the same organization as the national series, a free COTF America entry for the champion. Against: brand new, so nobody knows field sizes or how the one-day format plays; entry not posted. Fits with: Tri-C, almost perfectly.
SKUSA California ProKart Challenge (regional)
For: the step up without leaving the West; K1 rounds are home games. Against: 2027 venues TBA, and Sonoma/Spring Mountain rounds are travel weekends. Costs: $437 a round with tires in 2026.
COTF America West (national)
For: the fastest kids in the country, the best-run weekends we have seen, three of five rounds at K1. Against: $868 entry before anything else, Friday practice means school days, Sonoma and Utah are real trips, and the collision weekend. Only if the kid is ready; the race director will tell you if not.
SKUSA Pro Tour and SuperNationals (national)
For: Vegas in November is the biggest kart race in the country. Against: $1,950 entry for SuperNats alone; Pro Tour venues TBA. A season, not a step.