Every June the same advice circulates: it's summer, collectors are outside, prices dip, smart money buys. It's repeated confidently enough that we expected the data to show it. So we measured: 190 set-value histories and a hundred registry-tracked cards, month by month, across the two full summers our price data covers. Verdict up front: in this market, the summer dip is not a dip. It is a slowdown, it is narrower than the folklore says, and this year it has been almost entirely a modern-Charizard event.
A lull in July and August, a snap-back in September
Pooling monthly returns across every set we track: May runs hot (+5.2% median monthly set-value growth), June holds (+4.3%), July sags to +2.6%, August recovers to +4.3% at set level while individual tracked cards flatten to +0.3%, and September is the strongest month on the calendar (+7.0%). The same shape appears in the card-level basket. So yes, something real happens in mid-summer: momentum roughly halves. But the median never goes negative, and the true weakest stretch of the year isn't summer at all: it's December (+1.5%) and January (+2.5%), when the folklore says to buy anyway for different reasons. And 2025 breaks the rule outright: that summer outperformed the rest of its own year, +2.7% versus +1.3% monthly on the vintage basket.
The 2026 dip is a modern Charizard tax
Summer 2026, May 31 to August 4 · registry-tracked universe
| Card | May 31 | Aug 4 | Move |
|---|---|---|---|
| Charizard ex SIR · 151 | $453 | $366 | −19% |
| Charizard ex · SVP promo | $25 | $21 | −18% |
| Charizard VSTAR · Crown Zenith | $13 | $11 | −17% |
| Blastoise · Celebrations Classic | $18 | $13 | −30% |
| Gengar Poke Ball · JP 151 | $23 | $17 | −26% |
| Pikachu Star · Holon Phantoms | $1,830 | $3,200 | +75% |
| Pikachu · Skyridge | $80 | $128 | +61% |
| Ho-Oh · Call of Legends | $92 | $145 | +58% |
| Trainer's Pikachu · WotC promo | $259 | $377 | +46% |
Line up the losers and a pattern jumps out: four of the eight hardest-hit cards in our universe are Charizards, and all of the top losers are modern era. These are exactly the cards that led the spring leg of the rally, the ones with the most tourist money in them, and tourist money goes to the beach in July. Now line up the winners: Skyridge, Call of Legends, Holon Phantoms, WotC promos. Closed print runs, twenty-plus years old, still climbing straight through the supposed dip at double-digit monthly rates. This is the same rotation our weekly Spread report has been flagging all summer: the closed-print leg grinding higher while in-print product cools.
This summer's two markets
Set-level seasonality pools monthly closes from 190 sets with 12+ months of weekly TCGplayer value history (last weekly close per calendar month; absolute monthly moves over 150% discarded as data errors). Card-level figures use the registry-tracked universe: 88 cards priced $5+ with history through both endpoints, May 31 to August 4, 2026, compared against the same window in 2025. The vintage basket is 30 long-lived English cards. All history is real TCGplayer weekly data, which begins January 2025; no earlier seasonality is claimed, inferred, or modeled.