Start by rinsing all your fruits and vegetables under cool water, then pat them completely dry with paper towels. I skip this step at my own risk every single time, and the platter always ends up watery and dull-looking by the time guests arrive. Dry produce holds its shape and color much longer on display.
Cut your cucumbers into rounds, peppers into strips, and apples into thin wedges, keeping pieces roughly the same size for a tidy look. I toss my apple slices in lemon juice right away so they stay bright instead of turning brown. This is also when I halve strawberries and peel the clementines.
Place your largest, flattest pieces first, like cucumber rounds or lettuce leaves, to create a sturdy base across the platter. I usually work from the outer edge inward so the whole tray fills in evenly. This base also helps smaller pieces, like blueberries, stay put instead of rolling around.
Use your orange produce, like carrots, cherry tomatoes, and clementines, to build a pumpkin or jack-o'-lantern shape in one section of the tray. I like adding sliced olives as eyes or spider legs for a bit of spooky detail. Group your veggies and fruits separately so flavors don't bleed into each other.
Place your small bowls of ranch and yogurt dip directly onto the platter, nestled into open spaces so they don't slide around. I always add these last so I can see exactly how much room is left after arranging everything else. This is the moment the whole halloween fruit and veggie tray really comes together visually.
Cover the platter loosely with plastic wrap and refrigerate it for at least 15 minutes before your guests arrive. I've found this short chill keeps everything crisp and makes the colors look even more vibrant under party lighting. Pull it out right before serving so nothing wilts.