Azpeitia hosts a mountain-running event in May 2027, with two courses and up to 4,000 metres of elevation gain.
The Gipuzkoa race is scheduled for March 2027, while course and registration details are still to come.
The half marathon follows the old Urola railway line and shares its weekend with two other race distances.
Azpeitia will see out 2026 with a six-kilometer urban race; start times and fees are still to be confirmed.
A short race open to the community is part of the Marianist Olympics program in Donostia.
The five-kilometer event returns to Irun in December, while course and registration details remain unconfirmed.
Aduna hosts a late-November mountain duathlon with two running legs and one mountain-bike stage.
Three towns in the Bidasoa area will share a sporting day featuring water, cycling and running.
The Gipuzkoa event appears on the November calendar as a 10-kilometer race.
Bidania has a date for its mountain event, but the route, distances and other details have yet to be announced.
Three stages, nearly 24 kilometres of running and cycling, and two published start times for the November event.
The Gipuzkoa event has a confirmed date and town; here is what is known and what has yet to be announced.