This paper is devoted to the studies of total polyphenol content and antiradical activity of leaves of peppermint, flowers of chamomile and leaves and flowers lavender grown in local backyard gardens of Latvia. Aqueous ethanol with different ethanol towater ratio (96, 70 and 40% ethanol) and extraction conditions (maceration at room temperature, at dark or under day-light irradiation, as well as reflux) were tested. All extracts were analyzed for total polyphenol content (Folin–Ciocalteu method), as well as for antiradical activity (1,1-diphenyl-2-picryl hydrazyl and galvinoxyl assays). It was found out that local peppermint and chamomile is as good source of polyphenols as those plants grown in southern countries; however, the total polyphenol content of lavender is lower as that mentioned in literature. The highest polyphenol content for all plant materials was achieved using 40 or 70% ethanol for extraction. Peppermint extracts were found as most powerful free radical scavengers among all tested plant materials. 96% Ethanol extract of peppermint and chamomile demonstrated the highest antiradical activity, while 70% ethanol was the most suitable for preparation of lavender extract with optimal free radical scavenging activity.