The aim of this empirical laboratory study was to investigate the effect of immediate and delayed feedback on retrieval practice among Saudi EFL learners using short-answer tests administered at three different time points: immediately, one week later, and one month later. A total of 177 Saudi undergraduate EFL students were randomly assigned to four groups: Repeated Studying, Repeated Testing-no feedback, Repeated Testing-immediate feedback, and Repeated Testing-delayed feedback. Additionally, a restudy control group was included to compare retrieval practice and feedback effects to the restudy condition. Participants read a 487-word prose passage and underwent testing at the specified intervals. Results revealed that retrieval practice without feedback outperformed repeated studying in the one-month delayed test. Both immediate and delayed feedback groups outperform the no-feedback and restudying groups. Moreover, immediate feedback was found to be more effective than delayed feedback in enhancing long-term retention. These findings emphasize the importance of providing timely feedback to optimize retrieval practice and improve learning outcomes in EFL contexts.