Foster on Film discusses its influence on the horror genre. Moria notes that "This film of the John Wyndham novel is mostly – and rightly so – lambasted for the complete demolition job it does of the book." DVDTalk declares they have "always loved The Day of the Triffids - there's something wonderfully real about the post-apocalyptic menace in John Wyndham's 1951 novel." 1000 Misspent Hours opens with "This is another movie that I like a great deal more than I can really defend."
As a post-apocalyptic survival story, The Day of the Triffids scores surprisingly well, with a number of horrific developments that come about from mankind's sudden collective blindness.Classic Sci-Fi Movies calls it "one of the big B sci-fi movies of the early 60s." Need Coffee offers it as part of their 32 Days of Halloween series.