Mars does not always pass through Leo in one go. When it turns retrograde near the boundary it backs out into the previous sign and returns months later, which splits a single visit into separate windows. Most almanacs quote one date range and lose that.
27 April 1993 → 23 June 1993Past
4 October 1994 → 12 December 1994Past
22 January 1995 → 25 May 1995Re-entry after retrograde
9 September 1996 → 30 October 1996Past
20 August 1998 → 7 October 1998Past
1 August 2000 → 16 September 2000Past
13 July 2002 → 29 August 2002Past
23 June 2004 → 10 August 2004Past
3 June 2006 → 22 July 2006Past
9 May 2008 → 1 July 2008Past
16 October 2009 → 7 June 2010Past
19 September 2011 → 11 November 2011Past
28 August 2013 → 15 October 2013Past
8 August 2015 → 25 September 2015Past
20 July 2017 → 5 September 2017Past
1 July 2019 → 18 August 2019Past
11 June 2021 → 29 July 2021Past
20 May 2023 → 10 July 2023Past
4 November 2024 → 6 January 2025Past
18 April 2025 → 17 June 2025Re-entry after retrograde
28 September 2026 → 25 November 2026Upcoming
21 February 2027 → 14 May 2027Re-entry after retrograde
4 September 2028 → 24 October 2028Upcoming
15 August 2030 → 2 October 2030Upcoming
27 July 2032 → 12 September 2032Upcoming
8 July 2034 → 24 August 2034Upcoming
18 June 2036 → 5 August 2036Upcoming
29 May 2038 → 17 July 2038Upcoming
2 May 2040 → 26 June 2040Upcoming
8 October 2041 → 30 May 2042Upcoming
13 September 2043 → 3 November 2043Upcoming
23 August 2045 → 10 October 2045Upcoming
4 August 2047 → 20 September 2047Upcoming
15 July 2049 → 31 August 2049Upcoming
27 June 2051 → 13 August 2051Upcoming
6 June 2053 → 25 July 2053Upcoming
14 May 2055 → 5 July 2055Upcoming
22 October 2056 → 5 February 2057Upcoming
3 April 2057 → 10 June 2057Re-entry after retrograde
22 September 2058 → 15 November 2058Upcoming
26 March 2059 → 24 April 2059Re-entry after retrograde
30 August 2060 → 3 September 2060Upcoming