What date does Mammoth Cave use?

July 1, 1941 — Wikipedia’s Date established as park. Month and day assign the card; the year is unused.

What is Mammoth Cave's National Park birth card?

The Ace of Spades. That is a coordinate on the Card Blueprints calendar, not a fortune-telling claim about the park.

Where do the dates come from?

Primary: Wikipedia List of national parks of the United States, Date established as park. Footnotes: NPS Park Anniversaries. NPS Park Anniversaries lists Mammoth Cave National Park (authorized) (1926-05-26) as an earlier first-unit record. That date is cited, not mapped.

National Park coordinate

Mammoth Cave's National Park Birth Card: The Ace of Spades

Date established as National Park: July 1, 1941

Calendar coordinate only — month and day map to this card. Year is unused. Not a fortune-telling reading.

How the card is assigned

Mammoth Cave National Park (Kentucky) became a National Park on July 1, 1941. Card Blueprints uses July 1 — month and day only — and the public D1 birth-card rule (December 31 is the Joker). The year 1941 is unused.

Coordinate: the Ace of Spades. Live card page (Next.js origin): /birth-card/ace-of-spades.

Parks that share July 1

Haleakalā — July 1, 1961

Other parks on the Ace of Spades

Haleakalā — Ace of Spades

Mammoth Cave on the record

Mammoth Cave National Park is a national park of the United States in south-central Kentucky. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,007 acres (21,046 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties. The Green River runs through the park, with a tributary called the Nolin River feeding into the Green just inside the park. The cave system has formally been known as the Mammoth–Flint Ridge Cave System since 1972, when a connection was discovered between Mammoth Cave and the even longer system under Flint Ridge to the north. As of 2025, more than 426 miles (686 km) of passageways had been surveyed, over 1.5 times longer than the second-longest cave system, Mexico's Ox bel ha underwater cave. The park was established as a national park on July 1, 1941, after oft-contentious eminent domain proceedings whose consequences still affect the region. It was named a World Heritage Site on October 27, 1981; an international Biosphere Reserve on September 26, 1990; and an International Dark Sky Park on October 28, 2021.

Summarised from the lead section of the Wikipedia article Mammoth Cave National Park (CC BY-SA 4.0). Nothing here was written for this page beyond that article. National Park establishment dates come from the Wikipedia list column and NPS Park Anniversaries, not from this article.

FAQ

What date does Mammoth Cave use?: July 1, 1941 — Wikipedia’s Date established as park. Month and day assign the card; the year is unused.
What is Mammoth Cave's National Park birth card?: The Ace of Spades. That is a coordinate on the Card Blueprints calendar, not a fortune-telling claim about the park.
Where do the dates come from?: Primary: Wikipedia List of national parks of the United States, Date established as park. Footnotes: NPS Park Anniversaries. NPS Park Anniversaries lists Mammoth Cave National Park (authorized) (1926-05-26) as an earlier first-unit record. That date is cited, not mapped.

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The $9 Deep Dive is a written report for a birthday you enter — not a reading of Mammoth Cave National Park.

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Sources: Wikipedia CC BY-SA 4.0 (List of national parks of the United States, column “Date established as park”, retrieved 2026-09-06; article Mammoth Cave National Park) + NPS Park Anniversaries footnotes (nps.gov, retrieved 2026-09-06). Dates are not invented.