If you want a clean way to dive into 'Ice Planet Barbarians', I’d start with the publication order and treat the novellas as tasty extras you can slot in when they’re meant to be read. The main, numbered novels follow the core timeline and introduce characters and worldbuilding in an order that makes emotional sense — jump straight into book 1 and then move forward. The shorter stories and holiday novellas are fun detours, and they usually note which book they connect to, so I read those right after the novel that introduces the characters they focus on.
I personally like a slightly patient approach: read through the main series first to get the big arcs, then go back for short stories and spin-offs. Audiobooks are lovely for the long haul; some side stories are best enjoyed with a narrator who captures the tone. If you're keeping a list, mark novellas as you encounter them so you don’t accidentally spoil a reveal.
Overall, follow publication order for the safest, most satisfying journey through 'Ice Planet Barbarians' — it preserves the author’s intended pacing and emotional payoffs, and the side pieces feel like bonus scenes rather than required stops. Happy reading; the planet’s cold but the romances are warm.