Distributed practice and retrieval practice are promising learning strategies to use in education. We examined the effects of these strategies in primary school vocabulary lessons. Grades 2, 3, 4, and 6 children performed exercises that were part of the regular curriculum. For the distributed practice manipulation, the children performed six exercises distributed within 1 week (short‐lag repetition) or across 2 weeks (long‐lag repetition). For the repetition type manipulation, children copied a part of the description of a word (restudy) or recalled the description (retrieval practice). At the end of each week, the children received a cued‐recall vocabulary test. After 1 to 11 weeks they received a multiple‐choice vocabulary test. Both on the cued‐recall test and on the multiple‐choice test no benefits of long‐lag repetition and retrieval practice were found. These results put into question the practical value of long‐lag repetition and retrieval practice in real‐life primary school vocabulary lessons.Copyright © 2016 John Wiley & Sons, Ltd.