Well I tried to fight Day 7 horde in a winter biome without them, but to my great surprise cops showed up and wrecked my wooden-cobblestone starter base. That was totally unexpected for day 7...
Yeah, I ran into this my first horde night. I just ended up raising the fences up 1 block. Building the pathway out of half blocks would work as well. All depends on how your base is set up and what you'd prefer.