Oh man, this is my jam — postapocalyptic romance is like salt and caramel: gritty and oddly sweet. If you want a solid starter list, try 'Station Eleven' first. It’s not a steamy romance but the relationships (platonic and romantic) thread through the pandemic aftermath in a way that’s haunting and hopeful. Then there's 'Wool' by Hugh Howey, which layers slow-burn attractions into a claustrophobic survival mystery inside a silo.
For something more explicitly romantic with survival stakes, 'The Dog Stars' by Peter Heller is gorgeous; it’s about grief, a man and his dog, but also a fragile, sweet love that gives purpose in a ruined world. If you like zombies with heart, 'Warm Bodies' by Isaac Marion turns the genre into a full-on love story. YA readers might enjoy 'The Fifth Wave' for its action-romance blend, and 'Z for Zachariah' gives intense interpersonal tension in a small setting.
Beyond those, check out 'Parable of the Sower' by Octavia Butler for a harsher, philosophical survival tale with complex relationships, and 'Swan Song' by Robert McCammon for sprawling epic drama and romance. If you want something lighter or indie, try searching for “post-apocalyptic romance” tags on book blogs or self-pub platforms — there are a ton of hidden gems. Happy hunting; I love pairing a mug of tea with these kinds of books on rainy afternoons.