Method: Clean | Average | Optimistic Winter Ascent Dates only (Help)Count a peak only once per dayShow List using U.S. Units (Feet)

Ontario County High Points - Multiple Ascents Grid

RankGeographyPeak Elev-M  Prom-M TotalRound 1
1.Sudbury DistrictIshpatina Ridge693394  
2.Thunder BayTower Mountain679199  
3.TimiskamingIshpatina Ridge North677177  
4.AlgomaOgidaki Mountain665284  
5.NipissingSouthern Ontario High Point578367  
6.HaliburtonManitou Mountain56356  
7.KenoraKenora District High Point55991  
8.Rainy RiverRainy River District High Point544106  
8.SimcoeNiagara Escarpment High Point544271  
8.GreyGrey County High Point54439  
11.MuskokaMuskoka High Point54292  
11.DufferinDufferin County High Point54221  
11.HastingsHastings County High Point542113  
14.Parry SoundParry Sound High Point53275  
15.RenfrewRyans Mountain523218  
16.WellingtonLuther Benchmark511   
17.Sudbury CityWolf Lake Mountain504180  
18.Lennox and AddingtonMoger Pond Peak50136  
19.PeelPeel High Point49478  
20.CochraneGhost Range Peak488189  
21.WaterlooWaterloo High Point43841  
22.PeterboroughPeterborough County High Point43449  
23.PerthPerth County High Point42762  
24.FrontenacEvergreen Mountain417145  
25.HaltonHalton High Point414   
26.DurhamDurham High Point410133  
27.BruceBruce County High Point403   
28.Kawartha LakesKawartha Lakes High Point39786  
28.HuronHuron County High Point397   
30.OxfordOxford County High Point39153  
31.LanarkWhite Mountain38642  
32.YorkYork High Point37952  
33.NorthumberlandNorthumberland County High Point35662  
34.ManitoulinCup and Saucer352176  
35.MiddlesexMiddlesex County High Point342   
36.HamiltonHamilton High Point33037  
37.BrantBrant County High Point327   
38.ElginElgin County High Point296   
39.NorfolkNorfolk County High Point278   
40.BrantfordBrantford High Point267   
41.LambtonLambton County High Point264   
42.NiagaraNiagara High Point25975  
43.Chatham-KentChatham-Kent High Point233   
44.HaldimandHaldimand County High Point231   
45.EssexEssex County High Point228   
46.Leeds and GrenvilleLeeds and Grenville High Point212   
46.TorontoToronto High Point2122  
48.OttawaOttawa High Point16632  
49.Prince EdwardEast Picton Bay Hill15582  
50.Stormont, Dundas and GlengarryStormont-Dundas-Glengarry High Point12550  
51.Prescott and RussellVankleek Hill12354  

Main Peak List: Click here to see the standard peak listing, showning more informational columns and just the first ascent date.

Front Runners List: Click here to see list completion progress by climbers that log their climbs using

Compare Climbers: Click here to compare ascents of up to 5 climbers working on this list.

About the Multiple Ascent Grid:

  • This table grid shows all peaks on a given list, and all ascents done by Jason Potkay, up to 10 ascents per peak.
  • While many peakbaggers do not like to repeat ascents, some will try to do multiple "laps" or "rounds" of a favorite list, often one close to home.
  • The header for each ascent column shows, in parentheses, the total number of peaks climbed in each "round", and clicking the header link will sort your ascents for that round.
  • Due to space limitations, this listing has just the basic peak info, so up to ten date columns can be shown. Please use the main peak list (linked above) for more basic info and functionality.
  • Some climbers will log two ascents of the same peak on the same day--for example, when doing an out-and-back ridge run with other ascents sandwiched between two of the same peak. Some might not consider these to be two separate ascents for the purposes of doing multiple rounds. Clicking on the "Count a peak only once per day" link in the header will collapse multiple ascents of a peak on a single day into just one ascent for this grid list.

List Description

Ontario is administratively divided into 51 units that are a mixture of counties, unified counties, regional municipalities, districts, cities, and municipalities. Most of them were historically counties at one point, and despite changes in name or status, the boundaries have remained mostly stable over the years.

These units also correspond to the Canadian Census Divisions for the most part. Since the last revision of Census Divisions in 2001, the combined county of Haldimand-Norfolk split into Haldimand County and Norfolk County, and the City of Brantford separated from Brant County. That is why there are 51 entiries on this list, while the Census lists only 49 Divisions.


The main source for the Ontario county high point list was the excellent Ontario Basic Mapping database system created by the provincial government, which is a huge improvement over the old NTS 1:50,000 map sheets. To help generate this list, all the spot elevations (over 500,000 of them) in the OBM data were downloaded, matched to their county by a point-in-polygon operation, and the highest spot elevations picked out. Sometimes there was a swarm of spot elevations of the same height in the same general location, and one represenative point was picked. In other cases, separate areas were logged (see, for example, Chatham-Kent). Also, some OBM spot elevations were clearly erroneous outliers and had to be discarded. In general, though, a 1-meter difference in spot elevations was considered significant, and these lower points were not considered high-point candidates.

Once a set of county high points was generated, they were cross-checked with the 1:50,000 NTS maps, and some were adjusted a little bit based on information there. The result should be a reasonably accurate guide to the highest ground in the counties. Before tackling any county, though, be sure to check the OBM and NTS maps yourself to familiarlize yourself with the area. You may have to check out several nearby areas to be sure of locating the highest piece of earth, an occupational hazard of highpointers in relatively flat terrain like Ontario.


     Ontario Basic Mapping


Map Showing Location of Peaks

 = Peaks climbed by Jason Potkay   = Unclimbed peaks

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(Map only shows peaks ranked by clean prominence)

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