Two-year-olds use past memories to accomplish novel goals

•We examined memory-guided planning in 2-year-olds using three novel tasks.•Two-year-olds were able to use episodic memories to guide planning behaviors.•Two-year-olds were able to draw on past events to accomplish novel goals.•The cognitive foundations of episodic prospection may emerge by age 2 years. Memory-guided planning involves retrieving relevant memories and applying that information in service of a goal. Previous studies have shown substantial development in this ability from 3 to 4 years of age. We investigated the emergence of memory-guided planning by asking whether 2-year-olds could draw on episodic memories of past experiences to generate and execute plans. In Experiments 1 and 2 (N = 32, ds > .7), 2-year-olds successfully did so, and this ability developed significantly across the third year of life. Furthermore, in Experiment 3 (N = 19, d = 0.63), 2-year-olds successfully applied episodic memories to guide plans in a novel problem context, suggesting flexibility in this ability. Together, these results suggest that some form of memory-guided planning emerges during the third year of life and may form the cognitive basis for episodic prospection later in development.