Average Last Frost Dates for Ontario

About Last Frost Dates in Ontario

Average Last Frost dates vary in the Province of Ontario depending on latitude, elevation and proximity to the Great Lakes. The Far Northern areas of Ontario experience the latest last frost occurring in early to mid June while Southern areas along the shores of Lake Ontario and Lake Erie eperience last frost from late April to early May. Last Frost Dates were calculated using daily climate data from the period between 1991-2020.

Map List Related Pages

Interactive Map of Average Last Frost Dates for Ontario

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List of Average Last Frost Dates for Locations in Ontario

LocationAverage Last Frost Dates
ActonMay 21 - 31
Actons CornersMay 1 - 10
AjaxMay 11 - 20
AlexandriaMay 11 - 20
AllanburgMay 1 - 10
AllistonMay 11 - 20
AlmonteMay 11 - 20
AmherstburgMay 1 - 10
AngusMay 11 - 20
ArnpriorMay 21 - 31
ArthurMay 21 - 31
AuroraMay 11 - 20
AylmerMay 11 - 20
AzildaMay 11 - 20
BalaMay 1 - 10
BallantraeMay 11 - 20
BallinafadMay 21 - 31
BancroftMay 21 - 31
BarrieMay 21 - 31
Barry's BayJune 1 - 10
BaysvilleMay 21 - 31
BeetonMay 11 - 20
Belle RiverApril 21 - 30
BellevilleMay 1 - 10
BelmontMay 11 - 20
BlenheimMay 1 - 10
Blind RiverMay 21 - 31
BowmanvilleMay 11 - 20
BracebridgeMay 11 - 20
BradfordMay 11 - 20
BramptonMay 11 - 20
BranchtonMay 11 - 20
BrantfordMay 1 - 10
BrightonMay 11 - 20
BrockvilleMay 1 - 10
BrooklinMay 11 - 20
Bruce MinesMay 11 - 20
BurlingtonApril 11 - 20
CaledonMay 21 - 31
CaledoniaApril 21 - 30
CambridgeMay 11 - 20
CapreolMay 11 - 20
Carleton PlaceMay 11 - 20
CarlisleMay 1 - 10
Carlow/MayoJune 1 - 10
CartierJune 1 - 10
CasselmanMay 11 - 20
CayugaApril 21 - 30
CFB PetawawaMay 21 - 31
ChathamMay 1 - 10
ChelmsfordMay 21 - 31
ChesleyMay 11 - 20
Clarence-RocklandMay 21 - 31
ClintonMay 11 - 20
CobaltJune 1 - 10
CobourgMay 1 - 10
CochraneJune 11 - 20
CollingwoodMay 1 - 10
CornwallMay 1 - 10
CorunnaMay 1 - 10
CourticeMay 11 - 20
CourtlandMay 11 - 20
Deep RiverMay 21 - 31
DelhiMay 1 - 10
DeserontoMay 1 - 10
DorchesterMay 11 - 20
DorsetJune 1 - 10
DowlingMay 21 - 31
DresdenMay 1 - 10
DrydenMay 21 - 31
DubreuilvilleJune 11 - 20
DundasApril 21 - 30
DunnvilleMay 1 - 10
DurhamMay 11 - 20
Ear FallsJune 1 - 10
Elliot LakeJune 1 - 10
ElmiraMay 11 - 20
ElmvaleMay 11 - 20
EmbrunMay 11 - 20
EmeryvilleApril 21 - 30
EmoJune 1 - 10
EnglehartJune 1 - 10
ErinMay 21 - 31
ErnestownMay 1 - 10
EspanolaJune 1 - 10
EssexApril 21 - 30
ExeterMay 11 - 20
Fenelon FallsMay 21 - 31
Fennells CornerMay 21 - 31
FergusMay 11 - 20
FordwichMay 11 - 20
Fort AlbanyJune 21 - 30
Fort ErieMay 11 - 20
Fort FrancesJune 1 - 10
Fort SevernJune 1 - 10
FreeltonMay 11 - 20
GaltMay 11 - 20
GananoqueMay 11 - 20
GeorgetownMay 21 - 31
GeraldtonJune 1 - 10
GlencoeMay 11 - 20
GoderichMay 1 - 10
GogamaJune 11 - 20
GraftonMay 11 - 20
GravenhurstMay 1 - 10
GrimsbyMay 1 - 10
GuelphMay 11 - 20
HagersvilleMay 1 - 10
HaileyburyMay 21 - 31
HaliburtonJune 1 - 10
HamiltonApril 11 - 20
HanmerMay 11 - 20
HanoverMay 11 - 20
HarrowMay 1 - 10
HarrowsmithMay 11 - 20
HawkesburyMay 21 - 31
HearstJune 11 - 20
HespelerMay 11 - 20
Holland LandingMay 11 - 20
Huron ShoresMay 21 - 31
IgnaceJune 1 - 10
IngersollMay 11 - 20
InglesideMay 11 - 20
IngolfJune 1 - 10
Iron BridgeMay 21 - 31
Iroquois FallsJune 11 - 20
KapuskasingJune 11 - 20
KapuskasingJune 11 - 20
KearneyMay 21 - 31
KemptvilleMay 1 - 10
KenoraMay 21 - 31
KeswickMay 11 - 20
KincardineMay 21 - 31
King CityMay 11 - 20
KingstonMay 1 - 10
Kirkland LakeJune 11 - 20
KitchenerMay 11 - 20
LakefieldMay 21 - 31
LanarkMay 21 - 31
LansdowneMay 11 - 20
LaSalleMay 1 - 10
LeamingtonApril 21 - 30
LefaivreMay 21 - 31
LevackJune 1 - 10
LimerickMay 11 - 20
LincolnMay 1 - 10
LindsayMay 21 - 31
ListowelMay 11 - 20
Little CurrentJune 1 - 10
LondonMay 11 - 20
LonglacJune 1 - 10
MacTierMay 1 - 10
MarathonJune 1 - 10
MarkhamMay 1 - 10
MarmoraMay 11 - 20
Marten Falls First NationJune 1 - 10
MasseyJune 1 - 10
MatachewanJune 1 - 10
MattawaMay 21 - 31
MaynoothJune 1 - 10
MeafordMay 11 - 20
MerrickvilleMay 11 - 20
MetcalfeMay 11 - 20
MidlandMay 1 - 10
MiltonMay 11 - 20
MindenJune 1 - 10
MississaugaMay 1 - 10
MitchellMay 11 - 20
MoosoneeJune 21 - 30
MorrisburgMay 11 - 20
Mount AlbertMay 11 - 20
Mount ForestMay 11 - 20
NapaneeMay 1 - 10
New HamburgMay 11 - 20
New LiskeardMay 21 - 31
NewcastleMay 11 - 20
NewmarketMay 11 - 20
Niagara FallsMay 1 - 10
Niagara-on-the-LakeMay 1 - 10
NipigonJune 1 - 10
North CobaltJune 1 - 10
NorthshoreJune 1 - 10
NorwichMay 11 - 20
OakvilleApril 21 - 30
OnapingJune 1 - 10
OrangevilleMay 21 - 31
OrilliaMay 1 - 10
OshawaMay 11 - 20
OttawaMay 1 - 10
Owen SoundMay 11 - 20
PaisleyMay 11 - 20
PalmerstonMay 11 - 20
ParisMay 11 - 20
Parry SoundMay 1 - 10
PeawanuckJune 1 - 10
PelhamApril 21 - 30
PembrokeMay 21 - 31
PenetanguisheneMay 1 - 10
PerthMay 11 - 20
PetawawaMay 21 - 31
PeterboroughMay 11 - 20
PetroliaMay 1 - 10
PickeringMay 1 - 10
PictonApril 21 - 30
PikangikumJune 1 - 10
Pleasant PointMay 21 - 31
Port CarlingMay 1 - 10
Port ColborneMay 1 - 10
Port DoverMay 1 - 10
Port ElginMay 11 - 20
Port HopeMay 11 - 20
Port LambtonMay 1 - 10
Port PerryMay 21 - 31
Port StanleyMay 11 - 20
PowassanMay 21 - 31
PrescottMay 11 - 20
PrestonMay 11 - 20
Prince Edward CountyApril 21 - 30
QueensvilleMay 11 - 20
RamaMay 1 - 10
Red LakeJune 1 - 10
Red RockJune 1 - 10
RenfrewMay 21 - 31
Richmond HillMay 11 - 20
RidgetownMay 11 - 20
RocktonMay 1 - 10
RockwoodMay 21 - 31
RussellMay 11 - 20
SalfordMay 11 - 20
Sandy LakeMay 21 - 31
SarniaMay 1 - 10
Sauble BeachMay 11 - 20
Sault Ste. MarieMay 21 - 31
SchreiberJune 1 - 10
SeaforthMay 11 - 20
ShannonvilleMay 1 - 10
SheffieldMay 1 - 10
ShelburneMay 21 - 31
SimcoeMay 1 - 10
Sioux NarrowsMay 21 - 31
SkeadMay 11 - 20
Smiths FallsMay 11 - 20
Smooth Rock FallsJune 11 - 20
South MiddletonMay 11 - 20
SouthamptonMay 11 - 20
St ThomasMay 11 - 20
St. CatharinesMay 1 - 10
St. MarysMay 11 - 20
StaynerMay 11 - 20
Stoney CreekApril 11 - 20
StouffvilleMay 11 - 20
StratfordMay 11 - 20
StrathroyMay 11 - 20
Sturgeon FallsMay 11 - 20
SudburyMay 11 - 20
SuttonMay 11 - 20
Sutton WestMay 11 - 20
TavistockMay 11 - 20
TecumsehMay 1 - 10
TemagamiMay 21 - 31
Temiskaming ShoresMay 21 - 31
Terrace BayJune 1 - 10
ThessalonMay 11 - 20
ThornburyMay 11 - 20
ThoroldMay 1 - 10
Thunder BayJune 1 - 10
TillsonburgMay 11 - 20
TimminsJune 11 - 20
TorontoApril 21 - 30
TrentonMay 11 - 20
Tudor and CashelMay 11 - 20
TweedMay 11 - 20
TyendinagaMay 1 - 10
UxbridgeMay 21 - 31
Val CaronMay 11 - 20
Val ThereseMay 11 - 20
VandorfMay 11 - 20
VaughanMay 1 - 10
Victoria HarbourMay 1 - 10
Wainfleet TownshipApril 21 - 30
WalkertonMay 11 - 20
WallaceburgMay 1 - 10
Wasaga BeachMay 1 - 10
WaterdownApril 21 - 30
WaterfordMay 1 - 10
WaterlooMay 11 - 20
WawaJune 1 - 10
WellandApril 21 - 30
West Lincoln TownshipMay 1 - 10
WheatleyApril 21 - 30
WhitbyMay 11 - 20
WiartonMay 11 - 20
WilliamsburgMay 11 - 20
WinchesterMay 1 - 10
WindsorApril 21 - 30
WinonaApril 21 - 30
WollastonMay 21 - 31
WoodstockMay 11 - 20

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