A man drinks coffee with Starbucks' cup in Washington, United States on May 29, 2018
  • Starbucks customers in Philadelphia can get the chain's coffee delivered in the middle of the night.
  • Starbucks-trained baristas employed by Gopuff will prepare the orders at Gopuff's micro-fulfillment centers.
  • Delivery makes up just 2% of Starbucks' orders, though customers generally spend more per transaction.

Starbucks is offering late-night deliveries of coffee and food in a trial with Gopuff.

Starbucks CEO Laxman Narasimhan told investors at the coffee chain's earnings call on Tuesday that it was conducting a pilot with Gopuff "targeting a fully incremental opportunity for overnight orders" between 5 p.m. and 5 a.m..