The tallest tree in Ontario is currently a white pine in Arnprior that is 47 meters (154 feet) tall. Some other notably big and tall trees are listed below, with sources. The first table includes some modern champions, then below that is the complete honour roll of Ontario Trees as it existed in 2003. If the new champions are larger than the 2003 list (many of which are records from the 1980s and 90s) it is indicated in the “Champion” column. Eventually I hope to merge the lists. Learn more about Ontario’s oldest and biggest trees, including where to see them, in Ontario’s old-growth forests: a guidebook and Old-growth Forest Walks: 26 Hikes in Ontario’s Greenbelt. Ontario’s biggest trees are at risk from invasive species, to help make a difference sign this petition.

Note that size and age aren’t strongly related – most of Ontario’s oldest trees are relatively small. The list of Ontario’s oldest trees is being regularly updated, it is officially hosted on this website. Learn more about recognizing old trees.

Species	Diameter (cm)	Height (m)	Champion	Location / source
Alder, speckled	29	17	Yes	Burlington
Ash, red	132	27	Yes	Burlington
Butternut	116	24		Burlington
Chestnut, American	84	25	Yes	Niagara, N of Fonthill (1)
Dogwood, alt leaf	19	9	Yes	Burlington
Hickory, bitternut	123	30	Yes	Burlington
Oak, Hills	115	>25	Yes	Tillsonburg (2)
Oak, White	144	27		Burlington Germinated 1725
Pine, white		47		Arnprior

1. Ambrose, John, personal communication
2. O’Hara, Paul. personal communication

Below is the list of Ontario’s biggest trees, as it existed in 2003. I’ve posted it here since an updated version isn’t available online. The formula used to calculate the champions tends to emphasize girth over height.

The Champions

SOFTWOODS (GYMNOSPERMS) SPECIES NOMINATOR YEAR TREE LOCATION DIAMETER (cm) HEIGHT (m) POINTS PIC CEDAR EASTERN RED CEDAR JUNIPERUS VIRGINIANA D. WILLIAMS HAMILTON 1979 873 MONTGOMERY DRIVE ANCASTER, WENTWORTH 82.00 15.70 129 EASTERN WHITE CEDAR THUJA OCCIDENTALIS A. BUTWICK MILGROVE 1976 FALLS RESERVE CONS AREA BENMILLER, HURON 178.00 17.60 313 FIR BALSAM FIR ABIES BALSAMEA D. LEMMON BEARDMORE 1977 MIGNET LAKE NIPIGON, THUNDER BAY 47.00 30.50 143 HEMLOCK EASTERN HEMLOCK TSUGA CANADENSIS S. VASILIAUSKAS WHITNEY 1998 BIG TROUT LAKE ALGONQUIN PARK, NIPISSING 105.40 30.00 316 LARCH TAMARACK LARIX LARCINA D. THAIN BANCROFT 1998 LOT 6 CON 2, CARDIFF TWP , HALIBURTON 67.00 29.00 194 PINE EASTERN WHITE PINE PINUS STROBUS H. KENNEDY HALIBURTON 1975 INTERNATIONAL COOPERAGE CO. PROPERTY , HALIBURTON 172.00 45.10 776 JACK PINE PINUS BANKSIANA D. THAIN BANCROFT 1984 BIG WOMAN LAKE, GOODAL TWP , KENORA 70.00 25.00 175 PITCH PINE PINUS RIGIDA A. BUTWICK MILGROVE 1977 EAST OF IVY LEA BRIDGE , LEEDS AND GRENVILLE 47.00 19.70 93 RED PINE PINUS RESINOSA I. KENTELL PEMPROKE 1975 ALGONQUIN PARK ALGONQUIN PARK, NIPISSING 113.00 37.50 424 SPRUCE BLACK SPRUCE PICEA MARIANA D. THAIN BANCROFT 1984 LOON LAKE, MITCHEL TWP , KENORA 41.00 21.00 86 RED SPRUCE PICEA RUBENS R. KOABEL WELLAND 1986 HUNTSVILLE, MUSKOKA 83.00 22.90 190 WHITE SPRUCE PICEA GLAUCA D. THAIN BANCROFT 1991 LOT 24 CON 11, MCCLURE TWP , HASTINGS 79.00 39.00 308

HARDWOODS (ANGIOSPERMS) SPECIES NOMINATOR YEAR TREE LOCATION DIAMETER (cm) HEIGHT (m) POINTS PIC ALDER SPECKLED ALDER ALNUS RUGOSA J. PRINGLE HAMILTON 1976 BULLS PT. BOTANICAL GARDENS HAMILTON, WENTWORTH 27.00 14.30 39 APPLE WILD CRAB MALUS CORONARIA J. AMBROSE GUELPH 1982 S. DUMFRIES TWP , BRANT 8.00 4.00 3 ASH BLACK ASH FRAXINUS NIGRA J. MIHELL BARRYS BAY 1998 OPEONGO LAKE ALGONQUIN PARK, NIPISSING 76.20 29.50 225 BLUE ASH FRAXINUS QUADRANGULATA W. SCOTT SOMBRA 1976 SOMBRA TWP. SOMBRA, LAMBTON 85.00 21.20 180 RED (AND GREEN) ASH FRAXINUS PENSYLVANICA G. HIGHAM INGLESIDE 1981 LONG SAULT PARKWAY LOT 49 MOULINETT ISLAND, STORMONT, DUNDAS AND GLENGARRY 130.00 23.50 305 WHITE ASH FRAXINUS AMERICANA A. BUTWICK MILGROVE 1973 407 KING ST. NIAGARA ON THE LAKE, LINCOLN 127.00 31.40 399 BASSWOOD AMERICAN BASSWOOD NA D. THAIN BANCROFT 1998 DUNGANNON TWP , HASTINGS 189.00 23.00 435 BEECH AMERICAN BEECH FAGUS GRANIFOLIA A. BUTWICK MILGROVE 1975 SPRINGWATER CONS AREA SPRINGWATER, ELGIN 92.00 28.40 261 BIRCH CHERRY BIRCH BETULA LENTA A. BUTWICK MILGROVE 1976 15 MILE CREEK AND LAKESHORE ROAD ST. CATHERINES, LINCOLN 92.00 17.70 163 WHITE BIRCH BETULA PAPYRIFERA M. ROBINSON SUNRIDGE 1974 LOT 17, CONC. 1, STRONG TWSP SUNRIDGE, PARRY SOUND 118.00 13.70 162 YELLOW BIRCH BETULA ALLLEGHANIENSIS G. FELTON PARRY SOUND 1976 NORTH SHORE, LORIMER LAKE FERGUSON, PARRY SOUND 173.00 24.70 427 BUCKEYE OHIO BUCKEYE AESCULUS GALBRA J. DICK NIAGARA ON THE LAKE 1987 1127 LAKESHORE ROAD NIAGARA ON THE LAKE, LINCOLN 89.00 14.00 125 CHERRY AND PLUM BLACK CHERRY PRUNUS SEROTINA A. BUTWICK MILGROVE 1973 ROYAL BOTANICAL GARDENS HAMILTON, WENTWORTH 111.00 28.20 313 CHOKE CHERRY PRUNUS VIRGINIANA G. YAKI KINGSTON 1974 POINT ABINO, WELLAND 26.00 16.20 42 PIN CHERRY PRUNUS PENSYLVANICA S. VASILIAUSKAS WHITNEY 1998 OPEONGO LAKE ALGONQUIN PARK, NIPISSING 46.00 16.50 78 CANADA PLUM PRUNUS NIGRA J. SHERRIN TORONTO 1982 CLEARWATER BEACH , SIMCOE 5.00 4.50 2 WILD PLUM PRUNUS AMERICANA W. GILMOUR HAMILTON 1982 SENECA, HALDIMAND 7.50 3.00 2 CHESTNUT AMERICAN CHESTNUT CASTANEAA DENTATA J. AMBROSE GUELPH 1988 BURFORD, BRANT 64.00 26.00 166 CUCMUBER TREE CUCUMBER TREE MAGNOLIA ACUMINATA A. BUTWICK MILGROVE 1984 FENWICK, WELLAND 137.00 19.50 257 DOGWOOD ALTERNATE LEAVED DOGWOOD CORNUS ALTERNIFOLIA R. MICHELL BURLINGTON 1987 LA SALLE PARK BURLINGTON, WENTWORTH 18.00 8.00 14 EASTERN FLOWERING DOGWOOD CORNUS FLORIDA D. BROWN DRYDEN 1977 NE OF THAMESVILLE THAMESVILLE, KENT 36.00 12.20 44 ELM ROCK ELM ULMUS THOMASII A. BUTWICK MILGROVE 1975 KEENE, PETERBOROUGH 63.00 20.40 128 SLIPPERY ELM ULMUS RUBRA H. LANCASTER WINGHAM 1987 BAYFIELD, HURON 150.00 26.80 402 WHITE ELM ULMUS AMERICANA R. PERKINS SAULT STE. MARIE 1975 NICOLET TWP , ALGOMA 151.00 37.50 566 GUM BLACK GUM NYSSA SYLVATICA D. BROWN DRYDEN 1976 SOUTH OF STRATHROY STRATHROY, MIDDLESEX 104.00 21.60 225 HACKBERRY AMERICAN HACKBERRY CELTIS OCCIDENTALIA D. BROWN DRYDEN 1978 WEST OF LEAMINGTON LEAMINGTON, ESSEX 119.00 21.30 253 HAWTHORN COCKSPUR HAWTHORN CRATAEGUS CRUS-GALLI A. BUTWICK MILGROVE 1973 ANCASTER, WENTWORTH 50.00 10.00 50 DOWNY HAWTHORN CRATAEGUS MOLIS G. WALDRON AMHERSTBERG 1986 NORTH OF AMHERSTBURG AMHERSTBURG, ESSEX 62.00 6.80 42 HAWTHORN SPP CRATAEGUS SPP D. BROWN DRYDEN 1978 AMHERSTBURG, ESSEX 51.00 9.30 47 HICKORY BIG SHELLBARK HICKORY CARYA LACINIOSA A. BUTWICK MILGROVE 1976 SOUTHWEST OF CHATHAM CHATHAM, KENT 54.00 23.30 126 BITTERNUT HICKORY CARYA CORDIFORMIS P. RICE BURLINGTON 1980 BURLINGTON, WENTWORTH 111.00 29.00 322 PIGNUT HICKORY CARYA GALBRA M. LANDON SIMCOE 1973 EAST OF SIMCOE SIMCOE, SIMCOE 94.00 25.00 235 SHAGBARK HICKORY CARYA OVATA M. LANDON SIMCOE 1974 BACKUS WOODS ST. WILLIAMS, NORFOLK 95.00 32.00 304 HOP TREE HOP TREE PTELEA TRIFOLIATA J. AMBROSE GUELPH 1982 MIDDLE ISLAND LAKE ERIE, WELLAND 24.00 10.00 24 HORNBEAM BLUE BEECH CARPINUS CAROLINIANA A. LIPTAY KINGSVILLE 1979 KINGSVILLE, ESSEX 44.00 10.70 47 HOP HORNBEAM(IRONWOOD) OSTRYA VIRGINIANA A. MCCORMICK SHEDDEN 1987 SOUTHWOLD TWP , ELGIN 91.00 17.70 161 KENTUCKY COFFEE TREE KENTUCKY COFFEE TREE GYMNOCLADUS DIOICUS A. BUTWICK MILGROVE 1981 WEST STREET SIMCOE, SIMCOE 92.00 23.30 214 LOCUST HONEY LOCUST GLEDITSIA TRICANTHOS H. CLEMENT NIAGARA ON THE LAKE 1980 NORTH OF ST. DAVIDS NIAGARA, LINCOLN 126.00 25.30 319 MAPLE BLACK MAPLE ACER SACCHARUM SPP NIGRUM W. SCOTT SOMBRA 1976 SOMBRA TWP SOMBRA, LAMBTON 111.00 29.30 325 MANITOBA MAPLE ACER NEGUNDO A. MCCORMICK SHEDDEN 1984 ZORRA TWP , OXFORD 136.00 16.00 218 MOUNTAIN MAPLE ACER SPICATUM S. VASILIAUSKAS WHITNEY 1998 DICKSON LAKE ALGONQUIN PARK, NIPISSING 13.00 10.00 13 RED MAPLE ACER RUBRUM A. BUTWICK MILGROVE 1977 SQUIRREL ISLAND, LAMBTON 127.00 31.10 395 SILVER MAPLE ACER SACCHARINUM A. MCCORMICK SHEDDEN 1982 SOUTHWOLD TWP , ELGIN 208.00 32.40 647 STRIPED MAPLE ACER PENSYLVANICUM G. COX PRESQUILE 1975 PRESQUILE PROVINCIAL PARK PRESQUILE, NORTHUMBERLAND 27.00 16.80 45 SUGAR MAPLE ACER SACCHARUM A. BUTWICK MILGROVE 1973 COMFORT MAPLE, NORTH PELHAM NIAGARA, LINCOLN 191.00 25.00 477 MULBERRY RED MULBERRY MORUS RUBRA J. AMBROSE GUELPH 1984 BALLS FALLS CONS AREA NIAGARA, LINCOLN 31.00 16.00 50 OAK BLACK OAK QUERCUS VELUTINA D. BROWN DRYDEN 1978 KINGSVILLE, ESSEX 170.00 24.10 410 BUR OAK QUERCUS MACROCARPA J. CHAPMAN SIMCOE 1984 BURFORT TWP , BRANT 212.00 29.30 621 CHINQUAPIN OAK QUERCUS MUEHLENBERGII D. MACLEOD HYDE PARK 1977 NEAR FANSHAWE DAM LONDON, MIDDLESEX 144.00 22.60 325 PIN OAK QUERCUS PALUSTRIS G. WALDRON AMHERSTBERG 1986 MEMORIAL PARK WINDSOR, ESSEX 138.00 27.50 379 RED OAK QUERCUS RUBRA A. WOODLIFFE MORPETH 1984 HARWICH TWP , KENT 194.00 31.10 603 SWAMP WHITE OAK QUERCUS BICOLOR A. MCCORMICK SHEDDEN 1984 DELAWARE, MIDDLESEX 155.00 24.00 372 WHITE OAK QUERCUS ALBA N. OTONABEE REGION CONS. AUTHORIT PETERBOROUGH 1976 OTONABEE TWP. OTONABEE, PETERBOROUGH 191.00 27.10 518 PAWPAW PAWPAW ASIMINA TRILOBA M. LANDON SIMCOE 1973 MNR FOREST STATION ST. WILLIAMS, NORFOLK 23.00 7.30 17 POPLAR AND APSEN BALSAM POPLAR POPULUS BALSAMIFERA D. THAIN BANCROFT 1998 ARMOUR ROAD PETERBOROUGH, PETERBOROUGH 140.00 31.00 434 POPLAR AND ASPEN COTTONWOOD POPULUS DELTOIDES F. SCOTT-PEARCE CHATHAM 1982 GRAND AVE WEST CHATHAM, KENT 265.00 35.40 938 LARGETOOTH ASPEN POPULUS GRANDIDENTATA R. MICHELL BURLINGTON 1981 BURLINGTON, WENTWORTH 69.00 28.10 194 SERVICEBERRY ALLEGHENY SERVICEBERRY AMELANCHIER LAEVLS D. BROWN DRYDEN 1980 CARADOC TWP. , MIDDLESEX 57.00 12.20 69 DOWNY SERVICEBERRY AMELANCHIER ARBOREA W. GILMOUR HAMILTON 1979 SOUTHEAST OF ALBERTON HAMILTON, WENTWORTH 54.00 11.60 63 SUMAC STAGHORN SUMAC RHUS TYPHINA W. FOX LONDON 1950 LAKE HURON BLUFF GODERICH, HURON 33.00 7.40 24 SYCAMORE AMERICAN SYCAMORE PLANTANUS OCCIDENTALIS R. CAMPBELL DUTTON 1975 SYDENHAM RIVER ALVINSTON, LAMBTON 263.00 29.90 786 TULIP TREE TULIP TREE LIRIODENDERON TULIPIFERA M. LANDON SIMCOE 1973 NORMANDALE CEMETARY TURKEY POINT, NORFOLK 158.00 27.10 428 WALNUT BLACK WALNUT JUGLANS NIGRA R. CRAIG KINGSTON 1998 NORTH OF HWY 2 CATARAQUI, FRONTENAC 180.00 27.40 493 BUTTERNUT JUGLAS CINEREA S. GAYMAN ST. CATHERINES 1975 SHORT HILLS WILDERNESS AREA NIAGARA, LINCOLN 116.00 24.50 284

If you’re interested in tree measurement, and identifying old trees take a look at the FIELD SURVEY FOR OLD FORESTS / TREES datasheets, which includes notes on tree measurement on the last page.