AdjustHalloween app trends: Insights for your 2026 campaign | Adjust
Summary
Adjust analyzed installs and sessions around Halloween 2025, comparing each named day against a summer baseline (June 1–August 31, 2025 average) to isolate seasonal lift. The core argument: Halloween is no longer a single night, and a single global flight date will underperform. Consumer planning is shifting earlier—NRF reports 49% of U.S. shoppers start before October, spending is projected at a record $13.5 billion, and Trade Desk data shows content consumption climbing 22% into August, 25% into September, then 58% into October.
Key data points by category. Entertainment app installs peaked the weekend before Halloween, up 42% (Saturday, October 25) and 44% (Sunday, October 26) versus baseline, and up 130% and 100% YoY respectively—well above Halloween itself (18% Friday, 29% Saturday). Music and audio ramped later in that same weekend (41% Saturday, 56% Sunday) and only 13% on Halloween. OTT, streaming, and video content apps delivered the largest lift: 120% above baseline on October 25, and 300% YoY that day. Photo and video apps behave differently—their peak is Halloween night, up 15% in Canada, 13% in Germany, 11% in the U.K., 9% in the U.S., and 7% in Mexico versus the median of the four preceding Fridays, all above the 6% global average. Sessions then normalize within three to four days.
Market timing diverges sharply. The U.S. (+370%) and U.K. (+354%) peaked October 25, Germany peaked a day later (+137%), and Canada spiked to 342% on October 25, dipped to 60%, then climbed to 537% on November 2. Mexico runs a second wave: sessions hit 61% on October 31 and 63% on November 1, with installs peaking at 219% on November 2 during Día de los Muertos.
Actionable takeaways for ad ops: stagger campaign send dates by market rather than globally; concentrate push notifications, in-app events, and paid creative around each region's actual peak; use real-time alerts and audience segmentation to catch short bursts; and deep link users straight into the relevant Halloween or Día de los Muertos promotion.
Analyst Note
What's notable here is not the seasonal lift itself but the variance in when it lands. Peak install days for OTT and streaming apps split across October 25, 26, and — in Canada — November 2, with a 537% spike nearly a week after Halloween. That's a structural argument for market-level measurement over calendared global pushes, and it arrives as seasonal spend keeps climbing: $13.5B in projected US Halloween spending, with 49% of consumers planning before October. The pre-season window is widening at the same time its internal pacing is diverging by geography.
The competitive angle is that platform-level seasonal programming — Huluween, FearFest — now has measurable install consequences, which reframes content investment as an acquisition surface rather than pure retention. Entertainment and streaming categories are effectively borrowing tentpole playbooks from retail.
Worth watching is the measurement layer the piece positions against this: anomaly alerting, audience building from real-time behavioral segments, and query-based access to campaign data. As privacy constraints continue to erode deterministic signal, the ability to detect a market's spike while it's live — rather than reconstruct it post-campaign — becomes the differentiator. Mexico's Halloween-to-Día de los Muertos continuity shows how quickly a local calendar can outperform a global one.
The key implication for ad ops: attribution windows and alert thresholds tuned to a single holiday date may systematically undercount markets where the curve is still climbing.
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