The term "track and field" is generally not capitalized. It is a common noun referring to a collection of sports. Capitalization is only necessary at the beginning of a sentence. It is also capitalized when.

TL;DR

The phrase track and field remains lowercase in standard English unless it begins a sentence or names a specific competition like the World Athletics Championships. While it refers to a diverse collection of disciplines, it functions as a general category rather than a specific entity.

Why is it lowercase in most sentences?

Generally, sports names like track and field, football, or swimming are common nouns and do not require capitalisation in standard prose. This rule applies even when discussing technical standards like those set by World Athletics for events such as the marathon or the decathlon. Because the term describes a broad activity, it follows the same grammatical rules as other non-proprietary activities. This remains true even when referencing specialized apparel like track and field jerseys used during various competitions.

Final Thoughts: Correct usage ensures professional clarity when discussing these historical and technical sports. For track and field, readers should use the answer as practical guidance, then check the latest rules, availability, or product details before acting. That keeps the decision grounded in the current situation rather than a generic answer that may miss timing, league, or format changes. If the question involves equipment, venues, schedules, or eligibility, confirm the details at the point of purchase or registration.