The Short Answer
On the Endurance Grid calendar, most US triathlons fall between April and October, with the most in summer. June, July, and August held 347 of the 525 triathlons on our calendar since May 16, 2026, and August had the most, with 141. From November to March, our listings drop to a handful a month.
Based on 525 triathlons held on the Endurance Grid calendar since May 16, 2026, when our race history begins, and 427 listed ahead, as of November 8, 2026. We don't list every triathlon in the US.
Races by Month
Our race history begins on May 16, 2026, so the first column covers the months since then. The second column is what race directors have listed with us so far for the coming year. Listings fill in as races get closer, so those numbers will keep rising.
Month | Held in 2026 | Listed so far for 2027 |
|---|---|---|
January | — | 7 in 7 states |
February | — | 11 in 9 states |
March | — | 18 in 10 states |
April | — | 34 in 16 states |
May | 35 in 20 states (from May 16) | 50 in 23 states |
June | 101 in 37 states | 90 in 35 states |
July | 105 in 38 states | 66 in 32 states |
August | 141 in 40 states | 64 in 27 states |
September | 89 in 34 states | 47 in 23 states |
October | 49 in 22 states | 14 in 10 states |
November | 5 in 3 states (through Nov 7) | 16 in 12 states (Nov 8 on) |
December | — | 9 in 4 states |
See the June triathlon calendar or every upcoming triathlon.
When Listings Pick Up
On our calendar for 2027, listings more than double from March (18) to April (34), then climb to 90 in June.
The Busiest Months
In 2026, our calendar held 101 triathlons in June, 105 in July, and 141 in August, the most of any month. Summer is also when the races are most spread out: 37 to 40 states had a triathlon on our calendar each of those months. In August, New York had the most, with 13.
Winter Triathlons
From December through March, our calendar has only a handful of triathlons a month: 9 listed so far for December, 7 for January, and 11 for February. Florida has the most of the December to March races listed so far, with 9, followed by Texas, Illinois, and California with 4 each.
Sprint Triathlons
Most triathlons on our calendar offer a sprint distance: 284 of the 525 held since May 16, 2026, and 298 of the 427 listed ahead. Sprint triathlons follow the same season. Of the 284 held, 246 were from June through September, and August had the most, with 83 in 35 states. For 2027, June has the most listed so far, with 63, and December through February have 10 listed between them.
See every upcoming sprint triathlon.
Upcoming Triathlons
The Next Triathlons on Our Calendar
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