Combine the pumpkin, spice, dates, hemp hearts (if using), and almond milk in the blender. Blend until completely smooth.
Add in the ice, and blend again until the smoothie has a slushy texture. Serve right away for the best taste and texture.
Leftover smoothie can be stored in an airtight container in the fridge for up to 24 hours, but the texture will be very runny.
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Notes
If you would rather sweeten this smoothie with a banana instead of dates, I recommend using a frozen one. (Here's how to freeze bananas.) You'll also need to add maple syrup to taste, in that case, to boost the pie flavor.
Alternatively, you can use only maple syrup to sweeten this smoothie. My guess is that you'll need 1 to 2 tablespoons total. You can add extra ice to thicken the smoothie, as needed, in this case.