The 1978 Tarzan Calendar, based around his 12 cover paintings, was Boris' first calendar. It was well received so it was no surprise that several publishers asked Boris if he could also do calendars for them. There was insufficient time to produce one for 1979 so Boris took his time before selecting Workman Publishing as his publisher. They did their first Boris calendar for 1980 and have produced one annually ever since.
At the outset all the calendar artwork was produced by Boris. But for the 2001 Fantasy Calendar Boris was assisted by his wife, better known as the artist Julie Bell, and they have jointly done the paintings since then, sharing the workload more or less evenly.
A summary of the calendars appears below – click on the title to be taken to the relevant calendar's webpage.
| Calendar | W x H ins (cms) | Publisher | Artists | Commentary |
|---|---|---|---|---|
| 1978 Tarzan Calendar | 13 x 12 (33 x 30.5) | Ballantine Books | Boris | |
| 1979 Heroic Fantasy | 13 x 12½ (33 x 31.75) | September Publications | Boris & Others | |
| 1980 Boris's Heroes | 12.6 x 12 (32 x 30.5) | Verkerke Reprodukties | Boris | |
| 1980 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1981 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1982 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1983 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1984 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1985 Fantasy Calendar | 12½ x 12 (31.75 x 30.5) | Workman Publishing | Boris | |
| 1986 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1987 Fantasy Olympics Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1988 Fantasy Zodiac Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1988 Fantasy Olympics Calendar | 11¼ x 11¼ (28.7 x 28.7) | Lime Tree Publications | Boris | |
| 1989 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1990 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1991 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1992 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1993 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1994 Mythology Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | |
| 1995 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | Philip José Farmer |
| 1996 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | Philip José Farmer |
| 1997 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | Philip José Farmer |
| 1998 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | Philip José Farmer |
| 1999 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | Philip José Farmer |
| 2000 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris | C J Henderson |
| 2001 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2002 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2003 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2004 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2005 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2006 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2007 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2008 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2009 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | C J Henderson |
| 2010 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | Anthony Palumbo |
| 2011 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | Anthony Palumbo |
| 2012 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | Anthony Palumbo |
| 2013 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | Anthony Palumbo |
| 2014 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | Anthony Palumbo |
| 2015 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2016 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2017 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2018 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2019 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2020 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2021 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2022 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2023 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2024 Fantasy Calendar | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie | |
| 2025 Fantasy Calendar (Provisional) | 12 x 12 (30.5 x 30.5) | Workman Publishing | Boris & Julie |