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Soybean Maturity Groups
January 2015

By Jim Orf, Ph.D.
Soybean Breeding and Genetics
University of Minnesota
Phone: 612-625-8275


Executive Summary
(4 min 58 sec)

Full Presentation
(13 min 36 sec)


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for PC, Mac, and
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for iPhone


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Summary: This presentation will help consultants, growers, and other practitioners in the soybean growing regions of the U.S. and Canada understand maturity group designations of soybean varieties developed by public and private institutions or companies. Flowering and maturity of soybeans are determined by the day length of the location where they are grown. Soybean breeders have developed thirteen maturity group designations (using roman numerals) ranging from 000 to X. Maturity group 000 (triple zero) would designate soybean varieties adapted to tropical regions. In the U.S. producers grow maturity groups 00 to VIII. Many companies or institutions now use Arabic numbers for maturity groups and divide each maturity group into tenths (for example 2.9 or 5.8). If planted in mid-May, a full season variety (for a given location) will mature before the first frost (late September to early November). Maximum yield is usually obtained by using a full season variety.

Responsibility: United Soybean Board (USB) farmer-leaders develop and maintain partnerships with U.S. land grant universities and U.S. ag-focused research organizations such as the Plant Management Network to increase the transfer of checkoff-funded applied and practical production research information to U.S. soybean farmers. USB neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided.

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