Field Guides/Bancroft/Tyendinaga Cavern & Caves
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Featured inBancroft · Belleville · Hastings Highlands · Limerick · Marmora and Lake · Quinte West
CategoryGeology Discovery · Caving
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Tyendinaga Cavern & Caves.

Guided 45-minute tours of Ontario's largest natural cavern, 15 minutes north of Belleville in the Bay of Quinte

01 — About

The brief.

Tyendinaga Cavern & Caves is a family-owned attraction on Harmony Road in Belleville, Ontario, about 15 minutes north of the city off Highway 401 exit 556 and roughly 2.5 hours from both Toronto and Ottawa. Charles and Elizabeth Koch have operated the property for over 30 years and run guided tours of the cavern for nearly 20. The site is documented as Ontario's largest natural cavern, with limestone walls left in their original unmodified state, fossils dating back 450 million years, and a constant year-round temperature of about 10°C. Tours run every 30 minutes from mid-May through mid-October and combine an above-ground introduction with underground exploration of formations, glaciation evidence, and local geology.

02 — Programs

1. ways in.

  1. 01

    Join-In Tour

    For: All ages — children, families, and adults; beginner-level spelunkingWhen: May 16 – October 11, 2026; tours run every 30 minutes during open hours (Sat–Sun in spring and fall; Mon–Sat in July and August)

    A 45-minute guided tour — 15 minutes above ground, 30 minutes underground — through Ontario's largest natural cavern. Groups of 15–20 follow stone stairways and concrete floors past limestone formations, 450-million-year-old fossils, and evidence of glaciation, with ambient lighting throughout. The cavern sits at roughly 10°C year-round; a sweater and flat non-slip shoes are required. Strollers and wheelchairs cannot be accommodated due to multiple flights of stairs.

    Adults 18–64 $16.00 / Seniors 65+ $14.00 / Youth 13–17 $12.00 / Kids 5–12 $10.00 / Children 3–4 $5.00 / Under 2 free (taxes and parking included)

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03 — Notable

Worth knowing.

  1. 01Ontario's largest natural cavernSource ↗
  2. 02Fossils dating back 450 million years are visible within the cavernSource ↗
  3. 03Family-owned and operated by Charles and Elizabeth Koch for over 30 years; guided cavern tours offered for nearly 20 yearsSource ↗
  4. 04Limestone walls are unmodified — preserved in their original state without artificial alterationSource ↗
  5. 05Cavern maintains natural geothermal temperature of approximately 10°C / 58°F year-roundSource ↗
  6. 06Site developed using manual hand tools only (no drilling or blasting), with materials sourced exclusively from the propertySource ↗
  7. 07Includes a 1 km walking trail, above-ground lookout, picnic pavilion with cedar frame, and a wishing well; protected wildlife habitat with bat access holesSource ↗
  8. 08Located 10–15 minutes north of Belleville; 2.5 hours from Toronto or Ottawa via Highway 401 exit 556Source ↗
  9. 09Tours run every 30 minutes during operating hours and accommodate 15–20 participants per tourSource ↗
04 — Visit

Get in
touch.

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Address
2623 Harmony Road, Belleville, Ontario K8P 3E1, Canada
AER’s guide to Tyendinaga Cavern & Caves · Compiled from www.tyendinagacaves.caLast verified 2026-05-27