“Clay” describes a soil’s particles. It does not tell you everything about roots, drainage or how the yard is used. A useful plan starts with two comparisons: a healthy patch and a struggling one, each examined under similar moisture conditions.
Compare before you amend
Note where wheels, feet and equipment travel. Look for puddles after rain and record how long they remain. A soil test can guide fertility and pH decisions, but it does not replace observing water movement. Persistent wetness deserves its own drainage assessment.
Use aeration for the right problem
Compacted turf may benefit from hollow-tine core aeration when the grass can recover. Choose timing for your grass and local growing season, and avoid working saturated soil. Mark irrigation components first. For a small patch a hand tool may be realistic; a large lawn is a different labor decision.
Skip the bucket-of-sand solution
Oregon State advises against trying to improve clay by tilling in sand. Treat any amendment as a planned soil-management decision, with a clear purpose and amount, rather than an annual ritual. Start with a manageable test area, record what you did and compare rooting and water behavior over time.
More fertilizer will not correct compacted soil or a low spot that collects runoff.