Map of Ontario Average First Frost Dates

Zone 2
Jul. 11 - Jul. 20
Zone 3
Jul. 21 - Jul. 31
Zone 4
Aug. 1 - Aug. 10
Zone 5
Aug. 11 - Aug. 20
Zone 6
Aug. 21 - Aug. 31
Zone 7
Sep. 1 - Sep. 10
Zone 8
Sep. 11 - Sep. 20
Zone 9
Sep. 21 - Sep. 30
Zone 10
Oct.1 - Oct. 10
Zone 11
Oct. 11 - Oct. 20
Zone 12
Oct. 21 - Oct. 31
Zone 13
Nov. 1 - Nov. 10
Zone 14
Nov. 11 - Nov. 20

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

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

LocationAverage First Frost Date
ActonSep. 21 - Sep. 30
Actons CornersOct.1 - Oct. 10
AjaxOct.11 - Oct. 20
AlexandriaOct.1 - Oct. 10
AllistonOct.1 - Oct. 10
AlmonteSep. 21 - Sep. 30
AmherstburgOct. 21 - Oct. 31
AmherstburgOct. 21 - Oct. 31
AngusOct.1 - Oct. 10
ArnpriorSep. 21 - Sep. 30
ArthurOct.1 - Oct. 10
AuroraOct.11 - Oct. 20
AylmerOct.1 - Oct. 10
AylmerOct.1 - Oct. 10
AzildaSep. 21 - Sep. 30
BalaSep. 21 - Sep. 30
BallantraeOct.11 - Oct. 20
BancroftSep. 21 - Sep. 30
BarrieOct.1 - Oct. 10
Barry's BaySep. 21 - Sep. 30
BaysvilleSep. 21 - Sep. 30
BeetonOct.1 - Oct. 10
Belle RiverOct. 21 - Oct. 31
BellevilleOct.11 - Oct. 20
BelmontOct.1 - Oct. 10
BlenheimOct.11 - Oct. 20
Blind RiverOct.1 - Oct. 10
BowmanvilleOct.11 - Oct. 20
BracebridgeSep. 21 - Sep. 30
BradfordOct.1 - Oct. 10
BramptonOct.1 - Oct. 10
BranchtonOct.1 - Oct. 10
BrantfordOct.11 - Oct. 20
BrightonOct.1 - Oct. 10
BrockvilleOct.11 - Oct. 20
BrooklinOct.11 - Oct. 20
Bruce MinesSep. 21 - Sep. 30
BurlingtonOct.11 - Oct. 20
CFB PetawawaSep. 21 - Sep. 30
CaledonOct.1 - Oct. 10
CaledoniaOct.11 - Oct. 20
CambridgeOct.1 - Oct. 10
CapreolSep. 21 - Sep. 30
Carleton PlaceSep. 21 - Sep. 30
CarlisleOct.1 - Oct. 10
Carlow MayoSep. 21 - Sep. 30
CartierSep. 21 - Sep. 30
CasselmanSep. 21 - Sep. 30
CayugaOct.11 - Oct. 20
ChathamOct. 21 - Oct. 31
ChelmsfordSep. 21 - Sep. 30
ChesleyOct.1 - Oct. 10
Clarence-RocklandSep. 21 - Sep. 30
Clarence-RocklandSep. 21 - Sep. 30
ClintonOct.1 - Oct. 10
CobaltSep. 11 - Sep. 20
CobourgOct.11 - Oct. 20
CochraneSep. 1 - Sep. 10
CollingwoodOct.1 - Oct. 10
CornwallOct.1 - Oct. 10
CornwallOct.1 - Oct. 10
CorunnaOct. 21 - Oct. 31
CourticeOct.11 - Oct. 20
Deep RiverSep. 21 - Sep. 30
DelhiOct.1 - Oct. 10
DeserontoOct.11 - Oct. 20
DorchesterOct.1 - Oct. 10
DorsetSep. 21 - Sep. 30
DowlingSep. 21 - Sep. 30
DresdenOct.11 - Oct. 20
DrydenSep. 21 - Sep. 30
DubreuilvilleSep. 11 - Sep. 20
DundasOct.11 - Oct. 20
DunnvilleOct. 21 - Oct. 31
DurhamOct.1 - Oct. 10
Ear FallsSep. 21 - Sep. 30
Elliot LakeOct.1 - Oct. 10
ElmiraOct.1 - Oct. 10
ElmvaleOct.1 - Oct. 10
EmbrunSep. 21 - Sep. 30
EmeryvilleOct. 21 - Oct. 31
EmoSep. 11 - Sep. 20
EnglehartSep. 11 - Sep. 20
ErinSep. 21 - Sep. 30
ErnestownOct.1 - Oct. 10
EspanolaOct.1 - Oct. 10
EspanolaOct.1 - Oct. 10
EssexOct. 21 - Oct. 31
ExeterOct.1 - Oct. 10
FaradayOct.1 - Oct. 10
Fenelon FallsOct.1 - Oct. 10
Fennells CornerOct.1 - Oct. 10
FergusOct.1 - Oct. 10
FordwichOct.1 - Oct. 10
Fort AlbanyAug. 21 - Aug. 31
Fort ErieOct.11 - Oct. 20
Fort FrancesSep. 11 - Sep. 20
Fort SevernAug. 11 - Aug. 20
FreeltonOct.1 - Oct. 10
GaltOct.1 - Oct. 10
GananoqueOct.1 - Oct. 10
GeorgetownSep. 21 - Sep. 30
GeraldtonSep. 11 - Sep. 20
GlencoeOct.11 - Oct. 20
GoderichOct.1 - Oct. 10
GraftonOct.11 - Oct. 20
GravenhurstSep. 21 - Sep. 30
GrimsbyOct. 21 - Oct. 31
GuelphOct.1 - Oct. 10
HagersvilleOct.11 - Oct. 20
HaileyburySep. 11 - Sep. 20
HaliburtonSep. 21 - Sep. 30
HamiltonOct.11 - Oct. 20
HanmerSep. 21 - Sep. 30
HanoverOct.1 - Oct. 10
HarrowOct. 21 - Oct. 31
HarrowsmithOct.1 - Oct. 10
HawkesburySep. 21 - Sep. 30
HawkesburySep. 21 - Sep. 30
HearstSep. 11 - Sep. 20
HespelerOct.1 - Oct. 10
Holland LandingOct.11 - Oct. 20
HuntsvilleSep. 21 - Sep. 30
Huron ShoresOct.1 - Oct. 10
IgnaceSep. 11 - Sep. 20
IngersollOct.11 - Oct. 20
InglesideOct.1 - Oct. 10
IngolfSep. 11 - Sep. 20
Iron BridgeOct.1 - Oct. 10
Iroquois FallsSep. 1 - Sep. 10
KanataOct.1 - Oct. 10
KapuskasingSep. 1 - Sep. 10
KapuskasingSep. 1 - Sep. 10
KearneySep. 21 - Sep. 30
KemptvilleOct.1 - Oct. 10
KenoraSep. 21 - Sep. 30
KeswickOct.1 - Oct. 10
KinburnSep. 21 - Sep. 30
KincardineOct.1 - Oct. 10
King CityOct.11 - Oct. 20
KingstonOct.1 - Oct. 10
Kirkland LakeSep. 11 - Sep. 20
KitchenerOct.1 - Oct. 10
LaSalleOct. 21 - Oct. 31
LakefieldSep. 21 - Sep. 30
LanarkSep. 21 - Sep. 30
LansdowneOct.1 - Oct. 10
LeamingtonOct. 21 - Oct. 31
LefaivreSep. 11 - Sep. 20
LefaivreSep. 11 - Sep. 20
LevackSep. 21 - Sep. 30
LimerickOct.1 - Oct. 10
LincolnOct. 21 - Oct. 31
LindsayOct.1 - Oct. 10
ListowelOct.1 - Oct. 10
Little CurrentOct.1 - Oct. 10
LondonOct.1 - Oct. 10
LonglacSep. 11 - Sep. 20
MacTierSep. 21 - Sep. 30
ManotickOct.1 - Oct. 10
MarathonSep. 11 - Sep. 20
MarkhamOct. 21 - Oct. 31
MarmoraOct.1 - Oct. 10
MasseyOct.1 - Oct. 10
MatachewanSep. 11 - Sep. 20
MattawaSep. 21 - Sep. 30
MattawaSep. 21 - Sep. 30
MaynoothSep. 21 - Sep. 30
MeafordOct.1 - Oct. 10
MerrickvilleOct.1 - Oct. 10
MetcalfeSep. 21 - Sep. 30
MidlandOct.1 - Oct. 10
MiltonOct.1 - Oct. 10
MindenSep. 21 - Sep. 30
MississaugaOct.11 - Oct. 20
MitchellOct.1 - Oct. 10
Moose FactoryAug. 21 - Aug. 31
MoosoneeAug. 21 - Aug. 31
MorrisburgOct.1 - Oct. 10
Mount AlbertOct.11 - Oct. 20
Mount ForestOct.1 - Oct. 10
NapaneeOct.1 - Oct. 10
NepeanOct.1 - Oct. 10
New HamburgOct.1 - Oct. 10
New LiskeardSep. 11 - Sep. 20
NewcastleOct.11 - Oct. 20
NewmarketOct.11 - Oct. 20
Newton RobinsonOct.1 - Oct. 10
Niagara FallsOct. 21 - Oct. 31
Niagara-on-the-LakeNov. 1 - Nov. 10
NipigonSep. 11 - Sep. 20
North BaySep. 21 - Sep. 30
North CobaltSep. 11 - Sep. 20
NorthshoreOct.1 - Oct. 10
NorwichOct.1 - Oct. 10
OakvilleOct.11 - Oct. 20
OnapingSep. 21 - Sep. 30
OrangevilleSep. 21 - Sep. 30
OrilliaOct.1 - Oct. 10
OshawaOct.11 - Oct. 20
OttawaOct.1 - Oct. 10
Owen SoundOct.1 - Oct. 10
PaisleyOct.1 - Oct. 10
PalmerstonOct.1 - Oct. 10
ParisOct.1 - Oct. 10
Parry SoundSep. 21 - Sep. 30
PeawanuckJul. 21 - Jul. 31
PelhamOct.11 - Oct. 20
PembrokeSep. 21 - Sep. 30
PenetanguisheneOct.1 - Oct. 10
PerthOct.1 - Oct. 10
PetawawaSep. 21 - Sep. 30
PeterboroughSep. 21 - Sep. 30
PetroliaOct.11 - Oct. 20
PickeringOct. 21 - Oct. 31
PictonOct.11 - Oct. 20
PikangikumSep. 21 - Sep. 30
Pleasant PointOct.1 - Oct. 10
Port CarlingSep. 21 - Sep. 30
Port ColborneOct. 21 - Oct. 31
Port DoverOct.11 - Oct. 20
Port ElginOct.1 - Oct. 10
Port HopeOct.11 - Oct. 20
Port LambtonOct. 21 - Oct. 31
Port PerryOct.11 - Oct. 20
Port StanleyOct.1 - Oct. 10
PowassanSep. 11 - Sep. 20
PrescottOct.1 - Oct. 10
PrestonOct.1 - Oct. 10
Prince Edward CountyOct.11 - Oct. 20
QueensvilleOct.11 - Oct. 20
Red LakeSep. 11 - Sep. 20
Red RockSep. 11 - Sep. 20
RenfrewSep. 21 - Sep. 30
Richmond HillOct.11 - Oct. 20
RidgetownOct.11 - Oct. 20
RocktonOct.1 - Oct. 10
RockwoodOct.1 - Oct. 10
RussellSep. 21 - Sep. 30
Sandy LakeSep. 21 - Sep. 30
SarniaOct. 21 - Oct. 31
Sauble BeachOct.1 - Oct. 10
Sault Ste. MarieSep. 21 - Sep. 30
Sault Ste. MarieSep. 21 - Sep. 30
SchreiberSep. 11 - Sep. 20
SeaforthOct.1 - Oct. 10
ShannonvilleOct.11 - Oct. 20
SheffieldOct.1 - Oct. 10
ShelburneSep. 21 - Sep. 30
SimcoeOct.11 - Oct. 20
Sioux NarrowsSep. 21 - Sep. 30
SkeadSep. 21 - Sep. 30
Smiths FallsOct.1 - Oct. 10
Smooth Rock FallsSep. 1 - Sep. 10
SouthamptonOct.1 - Oct. 10
St ThomasOct.1 - Oct. 10
St. CatharinesNov. 1 - Nov. 10
St. MarysOct.1 - Oct. 10
StaynerOct.1 - Oct. 10
StittsvilleSep. 21 - Sep. 30
Stoney CreekOct.11 - Oct. 20
StouffvilleOct. 21 - Oct. 31
StratfordOct.1 - Oct. 10
StrathroyOct.11 - Oct. 20
Sturgeon FallsSep. 21 - Sep. 30
SudburySep. 21 - Sep. 30
SuttonOct.1 - Oct. 10
Sutton WestOct.1 - Oct. 10
TavistockOct.1 - Oct. 10
TecumsehOct. 21 - Oct. 31
TemagamiSep. 21 - Sep. 30
Temiskaming ShoresSep. 11 - Sep. 20
Terrace BaySep. 11 - Sep. 20
ThessalonSep. 21 - Sep. 30
ThornburyOct.1 - Oct. 10
ThoroldOct.11 - Oct. 20
Thunder BaySep. 11 - Sep. 20
TillsonburgOct.11 - Oct. 20
TimminsSep. 1 - Sep. 10
TorontoOct. 21 - Oct. 31
TrentonOct.1 - Oct. 10
Tudor and CashelOct.1 - Oct. 10
TweedOct.11 - Oct. 20
TyendinagaOct.11 - Oct. 20
UxbridgeOct.11 - Oct. 20
Val CaronSep. 21 - Sep. 30
Val ThereseSep. 21 - Sep. 30
VandorfOct.11 - Oct. 20
VaughanOct.11 - Oct. 20
Victoria HarbourOct.1 - Oct. 10
Wainfleet TownshipOct.11 - Oct. 20
WalkertonOct.1 - Oct. 10
WallaceburgOct. 21 - Oct. 31
Wasaga BeachOct.1 - Oct. 10
WaterdownOct.1 - Oct. 10
WaterfordOct.11 - Oct. 20
WaterlooOct.1 - Oct. 10
WawaSep. 11 - Sep. 20
WellandOct.11 - Oct. 20
West Lincoln TownshipOct. 21 - Oct. 31
WheatleyOct. 21 - Oct. 31
WhitbyOct.11 - Oct. 20
WiartonOct.1 - Oct. 10
WilliamsburgOct.1 - Oct. 10
WinchesterSep. 21 - Sep. 30
WindsorOct. 21 - Oct. 31
WinonaOct.11 - Oct. 20
WollastonOct.1 - Oct. 10
WoodstockOct.1 - Oct. 10
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