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Costco Seasonality

Historical month-by-month and year-by-year returns

Based on 41 calendar years of monthly closes, starting 1986.

By Month

MonthAverageMedian% PositiveBestWorst
January+1.9%+2.7%60%+18.7%14.9%
February+1.5%+1.7%53%+18.0%10.7%
March+1.6%+1.4%53%+14.0%13.0%
April0.7%+1.3%57%+15.3%35.1%
May+0.8%+1.1%65%+16.9%40.9%
June+2.6%+3.5%57%+16.2%11.4%
July+1.3%+1.9%63%+15.2%10.6%
August0.5%0.1%48%+19.7%17.1%
September+0.1%+0.7%53%+14.1%12.0%
October+2.5%+2.5%63%+19.8%33.0%
November+4.1%+4.3%75%+22.4%12.9%
December0.2%0.4%45%+22.4%16.3%

By Calendar Year

YearReturn
20255.9%
2024+38.8%
2023+44.6%
202219.6%
2021+50.7%
2020+28.2%
2019+44.3%
2018+9.5%
2017+16.2%
20160.9%
2015+13.9%
2014+19.1%
2013+20.6%
2012+18.5%
2011+15.4%
2010+22.0%
2009+12.7%
200824.7%
2007+31.9%
2006+6.9%
2005+2.2%
2004+30.2%
2003+32.5%
200236.8%
2001+11.1%
200012.5%
1999+26.4%
1998+61.8%
1997+77.6%
1996+64.8%
1995+18.4%
199433.1%
1993+6.2%
199227.9%
1991+28.0%
199015.1%
1989+23.3%
1988+14.5%
19870.0%

These are historical patterns, not a forecast — past calendar-month performance does not predict future returns.