Wyoming in 1869 gave women the right to vote and by extension to sit on a jury. Laramie was the first city to use them in 1870, albeit on a grand jury and not a trial jury and then only for a short time due to a judge's ruling. This ruling came about also in 1869 after Wyoming passed a law that banned women from juries. That law was in effect until 1949.
Since the series was set in Laramie circa 1880, by that point it would be unlikely women would have been on juries.
Since the series was set in Laramie circa 1880, by that point it would be unlikely women would have been on juries.