Planning a Halloween birthday party in 2026 typically costs between $75 and $300 for decorations alone, depending on how many kids you’re celebrating with and whether you want to go all-out on the spooky-birthday mashup or keep things simple. Most parents spending around $150 to $200 find they can create a memorable dual-theme setup that doesn’t feel like an afterthought to either occasion.
The biggest factors driving your decoration budget are party size, venue (backyard parties need more coverage than a single room), and how much you’re willing to DIY versus buy pre-made. If you’re feeling stretched thin, …
