There are 14 Barn Finds in Forza Horizon 5 at launch.
Forza Horizon 5 Barn Finds List and Maps: All barn locations and cars - GameRevolution, forza horizon 1 map
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Forza Horizon 5: all Barn Find locations, forza horizon 1 map
Forza Horizon 5 Barn Finds: All Locations
Forza Horizon 5: all Barn Find locations, forza horizon 1 map
Forza Horizon 5 barn finds guide — All 14 locations, forza horizon 1 map
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Forza Horizon 5 Barn Finds, map for hidden cars
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Forza Horizon 5 Barn Finds, map for hidden cars