From the publisher’s rulebook

Who goes first in Petrichor?

Mighty Boards English rulebook, 2019 printing

The person most recently caught in the rain starts, or select a first player by any other method.

Read the publisher’s rulebook

Rule details

Give that player the First Player marker.

During setup, place clouds in reverse play order beginning with the player to the starter’s right.

If there’s a tie

The cited starting-player instruction does not specify a tie-break. We don’t infer one.

Source & edition

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Found a different instruction in your edition? Send a correction with the game, edition, and source.