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Out in the world · Iowa

Iowa
champion trees.

Remarkable trees, a place to begin. Explore the register, get to know the species, and bring a little attention outdoors.

67 listed records66 records with map points34 Library species represented
Explore the Iowa mapRegister & coverage

The register behind the map

Dates, sources & coverage.

Iowa DNR current map · retrieved October 9, 2026

Published registerTree program

67 records are included in this imported selection. 66 have approximate map points; 1 remain searchable without a marker. Multiple trees can share one town or county point.

Register editions, retrieval dates, and individual measurement dates describe different things. This snapshot does not confirm current tree condition. Approximate map points do not locate individual trees or establish permission to visit.

How this register was selected and mapped

Iowa DNR’s current Big Tree Viewer, retrieved October 9, 2026. Its active map layer contains 159 records; we include the 67 whose status is explicitly rendered as “Champion Tree.” Status 2 and 3 are runners-up. We do not merge the separate older spreadsheet or derive additional champions from scores.

66 records use 36 approximate Census county points. One record has no published county and remains searchable without a marker. Private ownership is labelled private; other ownership does not establish visiting permission. Exact tree coordinates, addresses, directions, and personal contact details are not included.

The official web map labels circumference in feet despite a service field name that says inches. We convert those values to inches and preserve the original text in record notes. Height and crown spread are in feet. Explicit crown averages and published scores are retained even when inconsistent; crown diameter pairs without an explicit average remain text with an unknown numeric average. Last-update dates are shown separately from unconfirmed measurement dates. The map layer reports data last edited July 9, 2026.

Full source links on the shared map

A glimpse of the register

Look up. Look closer.

These are up to four of the highest published heights in this imported selection, when available. Measurements come from different dates; this preview creates no new champion or national titles. Open a record for its status, measurement context, and source notes.

Woodbury County

Eastern White Pine

Pinus strobus

Published height
120 ft
Published points
298.77

Measurement date: Not listed

Explore this record

Dubuque County

Rock Elm

Ulmus thomasii

Published height
111.58 ft
Published points
221.24

Measurement date: Not listed

Explore this record

Jasper County

Bitternut Hickory

Carya cordiformis

Published height
106.92 ft
Published points
228.05

Measurement date: Not listed

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Muscatine County

Black Ash

Fraxinus nigra

Published height
104.8 ft
Published points
203.43

Measurement date: Not listed

Explore this record

From a record to a relationship

Get to know the trees.

These Library species appear in Iowa’s imported register. Explore identification, seasonal observations, and a practice beside a tree. Photographs are species references taken elsewhere. Matches use scientific names without regard to capitalization; botanical synonyms remain separate.

A place to begin outdoors

Plan a thoughtful visit.

We have not published a Iowa visit guide yet. Start with a tree you can visit with permission nearby, or explore our guides in other states.

A five-minute practice with any treeExplore available visit guides
Open the Iowa mapReturn to a familiar tree