ALMA Cycle 13 Call for Proposals

The ALMA Director, on behalf of the Joint ALMA Observatory (JAO) and the partner organizations in East Asia, Europe, and North America, is pleased to announce the ALMA Cycle 13 Call for Proposals (CfP) for scientific observations to be scheduled from October 2026 to September 2027. For this CfP, the JAO anticipates having 4300 hours of approved science time on each of the 12-m, 7-m, and the Total Power arrays. Together, the 7-m Array and Total Power Array form the Atacama Compact Array (ACA), also known as the Morita Array. ALMA encourages proposals in configurations, LST ranges, and receiver bands that have been historically less heavily requested, including:

• ACA, especially in the LST range of 20h to 1h (note that ACA stand-alone proposals had, on average, a very high acceptance rate of 76% in Cycle 12)
• High frequency (Bands 8, 9, and 10) in any configuration
• Low frequency (Bands 1 through 4) at long baselines (C-7 through C-10), particularly for proposals focused on sources near RA of 22h

ALMA Cycle 13 proposal submission will open at

15:00 UTC on Thursday, 19 March 2026

The Cycle 13 proposal submission deadline is

15:00 UTC on Thursday, 23 April 2026

The key dates for the CfP in Cycle 13 are given in the following Table.

The ALMA Proposer’s Guide on the Science Portal contains all pertinent information regarding this ALMA CfP. A comprehensive description of the ALMA observatory and its components can be found in the ALMA Technical Handbook. Users should submit a Helpdesk ticket if they have any questions about ALMA or the Cycle 13 Call for Proposals.