Yumiri Hanamori, Nao Tōyama, Sayuri Hara, Aki Toyosaki, Rie Takahashi, Tomoyo Kurosawa, Shizuka Itō, Marina Inoue, Risae Matsuda and Akio Otsuka reprise their roles from the previous seasons.

[24] According to Laid-Back Camp author Afro, the season would introduce his favorite "Death Road" story from the manga series,[25] which is the fifty-ninth chapter in the eleventh volume ("Hatanagi Attack!!

[26] In July 2023, Yumiri Hanamori, Nao Tōyama, Sayuri Hara, Aki Toyosaki, and Rie Takahashi were set to reprise their respective roles from the previous seasons of Laid-Back Camp as Nadeshiko Kagamihara, Rin Shima, Chiaki Ōgaki, Aoi Inuyama, and Ena Saitō.

[15] Additional recurring cast were revealed in March 2024, namely Shizuka Itō as Minami Toba, Marina Inoue as Sakura Kagamihara, and Risae Matsuda as Akari Inuyama.

[17] The English dub cast for the season was announced in April 2024, namely Celeste Perez as Rin, Morgan Garrett as Nadeshiko, Katelyn Barr as Chiaki, Hannah Alyea as Aoi, Molly Zhang as Ena, Katie Wetch as Ayano, Larry Cassady as Hajime (Rin's grandfather) and the narrator, Leah Clark as Minami, Jalitza Delgado as Hana, and Marianne Bray as Hana's mother.

[34] In February 2024, the title of the opening and ending theme songs were revealed as "Laid-Back Journey" (レイドバックジャーニー, Reidobakku Jānī) and "So Precious", respectively.

[33] A character visual for Nadeshiko was released in October 2023,[36] followed by Rin and Ayano in November,[37][38] Chiaki in December,[39] Aoi in January 2024,[40] and Ena with her pet dog Chikuwa in February.

[42] In January 2024, Weiß Schwarz, a collectible card game by Bushiroad, announced a trial deck and booster pack based on the third season.

[44] Additional promotional partners included the outdoor goods brand Aozoragear, which featured a camper that was designed with illustrations of Nadeshiko and Rin;[45] the shokugan (food toy) company Heart, which produced character-themed 3D magnets;[46] and the insecticide manufacturer Fumakilla.

Despite the new staff and studio, he lauded the season for how it still depicted the spirit of camping and laid-back style, and highlighted areas of Japan that were never heard about such as the Ōi River.