In general, the goal is to make scientific data accessible as soon as possible. Specifically, the DMS Policy instructs researchers to share scientific data by the earlier of two time points:
Date of an associated publication
Scientific data supporting peer-reviewed journal articles should be made accessible no later than the date on which the article is first made available in print or electronic format.
End of the performance period
Scientific data that support findings not disseminated through peer-reviewed journal articles should be shared by the end of the performance period — unless the grant enters into a no-cost extension. If a no cost extension is permitted, then the recipient should share the data by the end of the extended performance period. These scientific data may support unpublished key findings, developments, and conclusions. Or they may support findings documented within preprints, conference proceedings, or book chapters.
For example, scientific data supporting null and negative findings are important to share even though these key findings aren’t always published. Researchers should be aware that some preprint servers may require the sharing of data upon preprint posting. Repositories storing data may also require public release of data upon preprint posting.