Recent national polling suggests about 25–30% of Americans support transgender women/girls playing on women’s or girls’ sports teams, depending on how the question is worded.
AP-NORC, May 2025: 26% said transgender girls/women should be allowed to participate in professional or college women’s sports; 27% said so for high school sports.
AP-NORC
Gallup, June 2025: 45% of Democrats supported allowing transgender athletes to play on teams matching their gender identity, but only about 10% of Republicans did; overall, 69% favored restricting athletes to teams matching their birth sex, implying roughly 3 in 10 did not favor that restriction.
Gallup.com
Pew, 2025: 27% were at least somewhat comfortable with transgender athletes playing on teams that don't match their sex at birth (13% very/extremely + 14% somewhat), while 73% were uncomfortable.
So, a good shorthand is roughly 1 in 4 to 1 in 3 Americans support allowing trans women to compete in women's sports. The exact percentage depends considerably on the wording and whether the question specifies high school, college, or professional sports.