Our third research piece tracks welcome-bonus values across 13 US sportsbook operators monthly from January 2024 through April 2026. Findings: the same operator's June offer is worth ~57% of its September peak; September (NFL kickoff) is the universal peak month for the field; bet365 has the smallest annual erosion gap (highest floor) of any tracked operator. The report includes a 12-month bettor calendar with verdict (best/good/mediocre/avoid) per month and per-operator volatility rankings. Free, citable, with full methodology.
Canonical coverage: This story is covered in depth on our linked guide. Read the full reference page for the complete context.