In the lunar calendar, when there are two fourth months, the second one is called a leap fourth month. A year with a leap fourth month has two fourth months. The leap fourth month has unique customs and culture. Learn more about it in the special section on the leap fourth month.

How often does a leap fourth month occur?

In the early 21st century, the leap fourth month is a common leap month, usually occurring every 8 or 11 years, and once every 38 years at most. It occurs less frequently than the leap fifth month.

When will the next leap fourth month be?

The next leap fourth month will be in 2020 (Gengzi Year), which is 1 year away from now.
Years with a leap fourth month after 2020 include:
2058 (Wuyin Year), 2069 (Jichou Year), 2077 (Dingyou Year), 2088 (Wushen Year), 2096 (Bingchen Year)
2107 (Dingmao Year), 2115 (Yihai Year), 2126 (Bingxu Year), 2145 (Yisi Year), 2164 (Jizi Year)
2183 (Guizhu Year), 2202 (Renyin Year), 2210 (Gengxu Year), 2221 (Xinyou Year), 2240 (Gengchen Year)
2278 (Wuwu Year), 2297 (Dingchou Year), 2316 (Bingshen Year), 2335 (Yimao Year), 2346 (Bingyin Year)
2365 (Yiyou Year), 2384 (Jichen Year), 2392 (Renzixu Year), 2430 (Gengyin Year), 2441 (Xinchou Year)
2460 (Gengshen Year), 2479 (Jiumao Year), 2498 (Wuxu Year), 2517 (Dingsi Year), 2536 (Bingzi Year)
2555 (Yiwu Year), 2574 (Jiyan Year), 2582 (Rengou Year), 2593 (Guixou Year), 2612 (Rengchen Year)
2650 (Gengwu Year), 2669 (Jichou Year), 2688 (Wushen Year), 2707 (Dingmao Year), 2756 (Bingchen Year)
2802 (Renyin Year), 2813 (Guichou Year), 2832 (Renshen Year), 2870 (Gengxu Year), 2889 (Jisi Year)
2908 (Wuzi Year), 2927 (Dingwei Year), 2938 (Wuwu Year), 2946 (Bingyin Year), 2957 (Dingchou Year)
2965 (Yiyou Year), 2984 (Jichen Year), 3022 (Renyu Year), 3033 (Guishi Year), 3052 (Renzi Year)
3060 (Gengshen Year), 3071 (Xinwei Year), 3079 (Jiumao Year), 3090 (Gengyin Year), 3109 (Jiyou Year)
3128 (Wuchen Year), 3147 (Dinghai Year), 3166 (Bingwu Year), 3174 (Jiyan Year), 3185 (Yichou Year)
3204 (Jiashen Year), 3215 (Yiwei Year), 3242 (Renyu Year), 3261 (Xinsi Year), 3280 (Gengzi Year)
3299 (Jiwei Year), 3310 (Gengwu Year), 3329 (Jichou Year), 3367 (Dingmao Year), 3394 (Jiawu Year)
3405 (Yisi Year), 3424 (Jizi Year), 3443 (Renyu Year), 3462 (Xinyin Year), 3481 (Xinyou Year)
3500 (Gengchen Year), 3519 (Jihai Year), 3538 (Wuwu Year), 3557 (Dingchou Year)

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