INTRODUCTION: Oncology nurses are key in caring for older adults with cancer, but few have received specialized training in gerontology. To address this, a geriatric oncology curriculum was developed for oncology nurses.MATERIALS & METHODS: The Geriatric Oncology Workshop (GrOW) was developed and delivered to oncology nurses (n=387) from 2016 to 2019. Workshops were evaluated using: 1) Assessment of preparedness, comfort, and skills; 2) Knowledge gained; 3) Participant evaluations of workshop (4-point Likert-type scale); 4) Faculty evaluations (10-point Likert-type scale); and 5) Follow-up assessment of goals. Descriptive statistics (frequencies, proportions, medians, means) were used to describe participants and results. Paired t-test was used to evaluate participants' knowledge gain, and linear mixed modeling was used to evaluate longitudinal changes in preparedness, comfort, and skill levels.RESULTS: Overall, 387 oncology nurses participated in GrOW. Participant-rated workshop evaluation means were 3.7 to 3.9. Overall, nurses had statistically significant increases in pre- to post- questionnaire scores of 18.8% (p<0.001) in workshop 1, 26.8% (p<0.001) in workshop 2, 24.9% (p<0.001) in workshop 3, and 18.6% (p<0.001) in workshop 4, with an overall mean of 22.4% (p<0.001) knowledge gained for all four workshops. Nurses reported an increase in skill, comfort, and preparedness at 18months for workshop 1, 2, and 3 and in skill and comfort at 12months for workshop 4 (p<0.01). Faculty evaluation scores ranged from 9.3 to 10.0.DISCUSSION: A geriatric oncology curriculum designed for oncology nurses can improve levels of evidence-based knowledge and provide more skill, comfort, and preparedness in caring for this population.