When to light a Yahrzeit Candle: According to Jewish custom, the yahrzeit candle is lit during the week of Shiva (mourning). It is also lit at sundown on the eve of the yahrzeit (anniversary of the death), at sundown preceding the start of Yom Kippur. Many also have the custom to light a candle at sundown preceding the last day of Succot, Passover and Shavuot (Holidays when Yizkor is said). Many Jews also have the custom of keeping a lit candle for the first year after the person's passing.
Yahrzeit Candles & Accessories