The second Riftbound Unleashed Summoner Skirmish appears to have a two- month event window tied to the Unleashed set, based on a public post discussing the skirmish timing and the Unleashed rollout. A June 2026 skirmish listing also suggests the event is still active in that period, but I can’t verify the exact start and end dates from the available info here.

What’s known

  • The Unleashed set was described as having a two-month window for the associated skirmish events.
  • A June 2026 “Unleashed Summoner Skirmish” prize-pack video indicates at least one skirmish ran in that month.
  • A locator entry exists for “Unleashed Summoner Skirmish II” , which points to a second scheduled event, but the snippet I can see does not include the full date range.

Practical read

If you’re asking for the event window , the safest answer is: the second Unleashed Summoner Skirmish was part of the two-month Unleashed skirmish period.

If you want the exact calendar window, the locator/event page would need the full event details visible to confirm the precise dates.

TL;DR: It was in the Unleashed skirmish window, which was described as a two-month period, but the exact dates aren’t visible from the available result.