http://revach.net/article.php?id=1981

Section: Halacha   Category: Tshuvos
Parshas Zachor For Women?
The Chinuch in Mitzva 603 says that the Mitzva of remembering what Amalek did to us only applies to men and not women.  The reason he gives is that the "Zechira" is a prelude to "Milachama", the eradication of Amalek.  Since women do not go to war the mitzva of remembering has no relevance to them.

The Minchas Chinuch asks on the Chinuch from the gemara in Sotah that says that even a Kallah leaves her Chupah to fight a Milchemes Mitzva.  This clearly indicates that it does apply to women.  He therefore concludes that women are obligated to hear Parshas Zachor.

Others hold that women are patur because it is a Mitzvas Aseh She'HaZman Grama, a time related mitzva that women are always exempt from.  Reasons given are that since Milchemes Amalek does not superseded Shabbos it is only a mitzva during the week and therefore it is time related.  Others say that since nighttime is not a time for warfare it is time related.

The Acharonim are divided as to the requirement of women listening to Parshas Zachor.  Some side with the Chinuch and say they are Patur.  Others were very stringent about women hearing it.  A third opinion holds that they should partake in the mitzva but they need not hear it in Shul from a sefer torah.  It is enough for them to read the pasukim from a chumash.

 Disclaimer: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.