4-H, as a research-based positive youth development program, should be affirming and inclusive for all youths, including those who are members of LGBTQ+ communities. This article provides 4-H youth development professionals with a series of checklists for supporting LGBTQ+ participation, focusing on systemic advocacy, guidance and protocols, programming, and professional development and dispositions. Using these checklists, 4-H professionals can identify areas of strength and growth for themselves and their programs. Further, they can enable youth thriving, increase protective factors, and reduce risk factors by cultivating inclusive and affirming 4-H spaces.