Once you've completed the prologue and reached a certain Influence level (usually after a few hours of gameplay), you'll unlock the full seasonal rotation. Each real-world week, the season in Forza Horizon 4 changes, bringing new challenges, events, and environmental conditions. This is the core of the game's long-term engagement.

Weekly Seasonal Changes:
- New Seasonal Championships: Each season introduces a set of unique championships that offer exclusive rewards, including rare cars and clothing items.
- Seasonal PR Stunts: New PR Stunts with specific car restrictions or seasonal challenges appear.
- Forzathon Shop Updates: The Forzathon Shop refreshes its inventory weekly with new cars and cosmetic items.
- Rival Events: New seasonal rival events become available.
- Environmental Changes: The map itself changes, with frozen lakes in winter, muddy trails in spring, and dry, dusty roads in summer.
Participating in seasonal events is crucial for maximizing your rewards and experiencing all the game has to offer. check the 'Festival Playlist' in the pause menu to see the current week's challenges and rewards.