Map of Ontario Average Last Frost Dates

Zone 5
Apr. 1 - Apr. 10
Zone 6
Apr. 11 - Apr. 20
Zone 7
Apr. 21 - Apr. 30
Zone 8
May 1 - May 10
Zone 9
May 11 - May 20
Zone 10
May 21 - May 31
Zone 11
Jun. 1 - Jun. 10
Zone 12
Jun. 11 - Jun. 20
Zone 13
Jun. 21 - Jun. 30

Plantmaps has derived zones indicating the Interactive map of average annual Last frost dates for the province of Ontario

List of Average Last Frost Dates for Cities and Towns in Ontario

LocationAverage First Frost Date
ActonMay 1 - May 10
Actons CornersMay 11 - May 20
AjaxMay 11 - May 20
AlexandriaMay 11 - May 20
AllistonMay 11 - May 20
AlmonteMay 11 - May 20
AmherstburgApr. 11 - Apr. 20
AmherstburgApr. 11 - Apr. 20
AngusMay 11 - May 20
ArnpriorMay 11 - May 20
ArthurMay 11 - May 20
AuroraMay 1 - May 10
AylmerMay 1 - May 10
AylmerMay 1 - May 10
AzildaMay 11 - May 20
BalaMay 11 - May 20
BallantraeMay 1 - May 10
BancroftMay 1 - May 10
BarrieMay 11 - May 20
Barry's BayMay 21 - May 31
BaysvilleMay 11 - May 20
BeetonMay 1 - May 10
Belle RiverApr. 21 - Apr. 30
BellevilleMay 1 - May 10
BelmontMay 1 - May 10
BlenheimApr. 21 - Apr. 30
Blind RiverMay 1 - May 10
BowmanvilleMay 1 - May 10
BracebridgeMay 21 - May 31
BradfordMay 1 - May 10
BramptonApr. 21 - Apr. 30
BranchtonMay 1 - May 10
BrantfordMay 1 - May 10
BrightonApr. 21 - Apr. 30
BrockvilleMay 11 - May 20
BrooklinMay 11 - May 20
Bruce MinesMay 11 - May 20
BurlingtonMay 1 - May 10
CFB PetawawaMay 21 - May 31
CaledonMay 1 - May 10
CaledoniaApr. 21 - Apr. 30
CambridgeMay 1 - May 10
CapreolMay 11 - May 20
Carleton PlaceMay 11 - May 20
CarlisleMay 1 - May 10
Carlow MayoMay 11 - May 20
CartierMay 11 - May 20
CasselmanMay 11 - May 20
CayugaApr. 21 - Apr. 30
ChathamApr. 21 - Apr. 30
ChelmsfordMay 11 - May 20
ChesleyMay 11 - May 20
Clarence-RocklandMay 1 - May 10
Clarence-RocklandMay 1 - May 10
ClintonMay 1 - May 10
CobaltJun. 1 - Jun. 10
CobourgApr. 21 - Apr. 30
CochraneJun. 1 - Jun. 10
CollingwoodMay 11 - May 20
CornwallMay 11 - May 20
CornwallMay 11 - May 20
CorunnaMay 1 - May 10
CourticeMay 11 - May 20
Deep RiverMay 21 - May 31
DelhiApr. 21 - Apr. 30
DeserontoMay 1 - May 10
DorchesterMay 1 - May 10
DorsetMay 11 - May 20
DowlingMay 11 - May 20
DresdenMay 1 - May 10
DrydenMay 1 - May 10
DubreuilvilleMay 21 - May 31
DundasMay 1 - May 10
DunnvilleApr. 21 - Apr. 30
DurhamMay 11 - May 20
Ear FallsMay 11 - May 20
Elliot LakeMay 1 - May 10
ElmiraMay 11 - May 20
ElmvaleMay 11 - May 20
EmbrunMay 1 - May 10
EmeryvilleApr. 21 - Apr. 30
EmoMay 21 - May 31
EnglehartJun. 11 - Jun. 20
ErinMay 1 - May 10
ErnestownApr. 21 - Apr. 30
EspanolaMay 1 - May 10
EspanolaMay 1 - May 10
EssexApr. 11 - Apr. 20
ExeterMay 11 - May 20
FaradayMay 1 - May 10
Fenelon FallsMay 11 - May 20
Fennells CornerMay 11 - May 20
FergusMay 1 - May 10
FordwichMay 11 - May 20
Fort AlbanyJun. 21 - Jun. 30
Fort ErieApr. 21 - Apr. 30
Fort FrancesMay 21 - May 31
Fort SevernJun. 1 - Jun. 10
FreeltonMay 1 - May 10
GaltMay 1 - May 10
GananoqueMay 1 - May 10
GeorgetownMay 1 - May 10
GeraldtonJun. 1 - Jun. 10
GlencoeMay 11 - May 20
GoderichMay 1 - May 10
GraftonApr. 21 - Apr. 30
GravenhurstMay 11 - May 20
GrimsbyApr. 21 - Apr. 30
GuelphMay 1 - May 10
HagersvilleApr. 21 - Apr. 30
HaileyburyJun. 1 - Jun. 10
HaliburtonMay 11 - May 20
HamiltonMay 1 - May 10
HanmerMay 11 - May 20
HanoverMay 11 - May 20
HarrowApr. 11 - Apr. 20
HarrowsmithApr. 21 - Apr. 30
HawkesburyMay 21 - May 31
HawkesburyMay 21 - May 31
HearstJun. 1 - Jun. 10
HespelerMay 1 - May 10
Holland LandingMay 1 - May 10
HuntsvilleMay 11 - May 20
Huron ShoresMay 1 - May 10
IgnaceMay 21 - May 31
IngersollMay 1 - May 10
InglesideMay 11 - May 20
IngolfMay 21 - May 31
Iron BridgeMay 1 - May 10
Iroquois FallsJun. 1 - Jun. 10
KanataMay 1 - May 10
KapuskasingJun. 1 - Jun. 10
KapuskasingJun. 1 - Jun. 10
KearneyMay 11 - May 20
KemptvilleMay 11 - May 20
KenoraMay 11 - May 20
KeswickMay 11 - May 20
KinburnMay 11 - May 20
KincardineMay 1 - May 10
King CityMay 1 - May 10
KingstonApr. 21 - Apr. 30
Kirkland LakeJun. 1 - Jun. 10
KitchenerMay 1 - May 10
LaSalleApr. 11 - Apr. 20
LakefieldMay 1 - May 10
LanarkMay 11 - May 20
LansdowneMay 1 - May 10
LeamingtonApr. 11 - Apr. 20
LefaivreMay 21 - May 31
LefaivreMay 21 - May 31
LevackMay 11 - May 20
LimerickMay 1 - May 10
LincolnApr. 21 - Apr. 30
LindsayMay 11 - May 20
ListowelMay 11 - May 20
Little CurrentApr. 21 - Apr. 30
LondonMay 1 - May 10
LonglacMay 21 - May 31
MacTierMay 11 - May 20
ManotickMay 1 - May 10
MarathonMay 1 - May 10
MarkhamMay 1 - May 10
MarmoraMay 1 - May 10
MasseyMay 1 - May 10
MatachewanJun. 1 - Jun. 10
MattawaMay 11 - May 20
MattawaMay 11 - May 20
MaynoothMay 11 - May 20
MeafordMay 11 - May 20
MerrickvilleMay 11 - May 20
MetcalfeMay 1 - May 10
MidlandMay 11 - May 20
MiltonMay 1 - May 10
MindenMay 11 - May 20
MississaugaApr. 21 - Apr. 30
MitchellMay 11 - May 20
Moose FactoryJun. 21 - Jun. 30
MoosoneeJun. 21 - Jun. 30
MorrisburgMay 11 - May 20
Mount AlbertMay 11 - May 20
Mount ForestMay 11 - May 20
NapaneeMay 1 - May 10
NepeanMay 1 - May 10
New HamburgMay 1 - May 10
New LiskeardJun. 1 - Jun. 10
NewcastleMay 1 - May 10
NewmarketMay 1 - May 10
Newton RobinsonMay 11 - May 20
Niagara FallsApr. 21 - Apr. 30
Niagara-on-the-LakeApr. 21 - Apr. 30
NipigonMay 21 - May 31
North BayMay 11 - May 20
North CobaltJun. 1 - Jun. 10
NorthshoreMay 1 - May 10
NorwichMay 1 - May 10
OakvilleMay 1 - May 10
OnapingMay 11 - May 20
OrangevilleMay 1 - May 10
OrilliaMay 1 - May 10
OshawaMay 11 - May 20
OttawaMay 1 - May 10
Owen SoundMay 1 - May 10
PaisleyMay 1 - May 10
PalmerstonMay 11 - May 20
ParisMay 1 - May 10
Parry SoundMay 21 - May 31
PeawanuckJun. 1 - Jun. 10
PelhamApr. 21 - Apr. 30
PembrokeMay 21 - May 31
PenetanguisheneMay 11 - May 20
PerthMay 11 - May 20
PetawawaMay 21 - May 31
PeterboroughMay 11 - May 20
PetroliaMay 1 - May 10
PickeringMay 11 - May 20
PictonApr. 21 - Apr. 30
PikangikumMay 21 - May 31
Pleasant PointMay 1 - May 10
Port CarlingMay 11 - May 20
Port ColborneApr. 11 - Apr. 20
Port DoverApr. 21 - Apr. 30
Port ElginMay 1 - May 10
Port HopeApr. 21 - Apr. 30
Port LambtonApr. 21 - Apr. 30
Port PerryMay 11 - May 20
Port StanleyMay 1 - May 10
PowassanMay 11 - May 20
PrescottMay 1 - May 10
PrestonMay 1 - May 10
Prince Edward CountyMay 1 - May 10
QueensvilleMay 1 - May 10
Red LakeMay 21 - May 31
Red RockMay 21 - May 31
RenfrewMay 11 - May 20
Richmond HillMay 1 - May 10
RidgetownMay 1 - May 10
RocktonMay 1 - May 10
RockwoodMay 1 - May 10
RussellMay 1 - May 10
Sandy LakeMay 21 - May 31
SarniaMay 1 - May 10
Sauble BeachMay 1 - May 10
Sault Ste. MarieMay 21 - May 31
Sault Ste. MarieMay 21 - May 31
SchreiberMay 1 - May 10
SeaforthMay 11 - May 20
ShannonvilleMay 1 - May 10
SheffieldMay 1 - May 10
ShelburneMay 1 - May 10
SimcoeApr. 21 - Apr. 30
Sioux NarrowsMay 11 - May 20
SkeadMay 11 - May 20
Smiths FallsMay 11 - May 20
Smooth Rock FallsJun. 1 - Jun. 10
SouthamptonMay 1 - May 10
St ThomasMay 1 - May 10
St. CatharinesApr. 21 - Apr. 30
St. MarysMay 1 - May 10
StaynerMay 11 - May 20
StittsvilleMay 11 - May 20
Stoney CreekMay 1 - May 10
StouffvilleMay 1 - May 10
StratfordMay 1 - May 10
StrathroyMay 11 - May 20
Sturgeon FallsMay 11 - May 20
SudburyMay 11 - May 20
SuttonMay 1 - May 10
Sutton WestMay 1 - May 10
TavistockMay 1 - May 10
TecumsehApr. 11 - Apr. 20
TemagamiJun. 1 - Jun. 10
Temiskaming ShoresJun. 1 - Jun. 10
Terrace BayMay 1 - May 10
ThessalonMay 1 - May 10
ThornburyMay 11 - May 20
ThoroldApr. 21 - Apr. 30
Thunder BayMay 21 - May 31
TillsonburgMay 1 - May 10
TimminsJun. 1 - Jun. 10
TimminsJun. 1 - Jun. 10
TorontoApr. 11 - Apr. 20
TrentonMay 1 - May 10
Tudor and CashelMay 1 - May 10
TweedMay 1 - May 10
TyendinagaMay 1 - May 10
UxbridgeMay 11 - May 20
Val CaronMay 11 - May 20
Val ThereseMay 11 - May 20
VandorfMay 1 - May 10
VaughanApr. 21 - Apr. 30
Victoria HarbourMay 11 - May 20
Wainfleet TownshipApr. 21 - Apr. 30
WalkertonMay 11 - May 20
WallaceburgMay 1 - May 10
Wasaga BeachMay 11 - May 20
WaterdownMay 1 - May 10
WaterfordApr. 21 - Apr. 30
WaterlooMay 11 - May 20
WawaJun. 1 - Jun. 10
WellandApr. 21 - Apr. 30
West Lincoln TownshipApr. 21 - Apr. 30
WheatleyApr. 11 - Apr. 20
WhitbyMay 11 - May 20
WiartonMay 1 - May 10
WilliamsburgMay 11 - May 20
WinchesterMay 1 - May 10
WindsorApr. 11 - Apr. 20
WinonaApr. 21 - Apr. 30
WollastonMay 1 - May 10
WoodstockMay 1 - May 10
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