The completion of residency and start of fellowship training marks a critical transition for urologists in the pursuit of subspeciality training. Most graduating urology residents are under contract until June 30, and most fellowships are scheduled to begin on July 1. There has been no investigation into the practical implications of fellowship delays in urology from a trainee perspective. Our research study aimed to investigate the incidence and predictors of delays in fellowship starts. Pediatric urology fellows that began their fellowship training between 2019 and 2023 and endourologic fellows that began their fellowship training between 2017 and 2022 were surveyed using SurveyMonkey®. A total of 250 endourology (EU) fellows and 90 pediatric urology (PU) fellows were contacted. A total of 26.0% and 14.3% of EU and PU fellows, respectively, experienced a delay in their training, despite many leaving their residency positions early (33.8% vs. 44.9%, p=0.2097); 11.7% and 8.2% of EU and PU fellows, respectively, experienced delays they reported to be "very stressful" and 9.1% and 4.1%, respectively, found them "somewhat stressful." Delays of 2-4 weeks were experienced by 5.2% and 6.1%, 4-6-week delays by 7.8% and 4.1%, and delays >6 weeks by 2.6% and 0% of EU and PU fellows, respectively (p=0.0007). Delays in fellowship training do occur at a notable rate, despite nearly half of urology fellows leaving their residency training positions early, with unclear impacts on patient care and resident colleague well-being. This research highlights the importance of fellowship programs considering delaying fellowship starts to mid-July or August, with support of the prior fellow cohorts.