Dill — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
Safe in small amounts, fresh or dried.
The full verdict, portion guidance and serving notes are collected on the Dill food facts page.
Short answer
Yes, dill itself is safe for cats, even if it spent the night out. The main risk with older food is spoilage or mould, which can cause stomach upset. Watch your cat for signs like vomiting or diarrhea over the next day. If you see any of those, or if the dill looked mouldy, call your own vet for advice.