Ontario Planting Calendar
Ontario spans USDA hardiness zones 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a. Planting dates vary significantly across the state depending on your zone. Find your county on the map below for exact frost dates and planting windows.
Find Your County
Click any county to see your local planting calendar with exact frost dates and planting windows.
Zones in Ontario
Zone 4a
Winter low: -30 to -25°F
145
Growing Days
May 6
Last Frost
Sep 28
First Frost
1
Counties
Zone 4b
Winter low: -25 to -20°F
155
Growing Days
May 1
Last Frost
Oct 3
First Frost
1
Counties
Zone 5b
Winter low: -15 to -10°F
178
Growing Days
Apr 18
Last Frost
Oct 13
First Frost
3
Counties
Zone 6a
Winter low: -10 to -5°F
193
Growing Days
Apr 10
Last Frost
Oct 20
First Frost
2
Counties
Zone 6b
Winter low: -5 to 0°F
205
Growing Days
Apr 3
Last Frost
Oct 25
First Frost
4
Counties
Zone 7a
Winter low: 0 to 5°F
221
Growing Days
Mar 25
Last Frost
Nov 1
First Frost
2
Counties
Zone 7b
Winter low: 5 to 10°F
235
Growing Days
Mar 18
Last Frost
Nov 8
First Frost
4
Counties
Zone 8a
Winter low: 10 to 15°F
255
Growing Days
Mar 8
Last Frost
Nov 18
First Frost
3
Counties
Growing Season Comparison
Growing Season by Zone
Zone 1a
Jun 15 – Aug 15
Zone 1b
Jun 7 – Aug 25
Zone 2a
May 30 – Sep 1
Zone 2b
May 22 – Sep 10
Zone 3a
May 15 – Sep 15
Zone 4a
May 6 – Sep 28
Zone 5a
Apr 25 – Oct 8
Zone 5b
Apr 18 – Oct 13
Zone 6a
Apr 10 – Oct 20
Zone 6b
Apr 3 – Oct 25
Zone 7a
Mar 25 – Nov 1
Zone 7b
Mar 18 – Nov 8
Zone 8a
Mar 8 – Nov 18
Zone 8b
Feb 25 – Nov 28
Zone 9a
Feb 10 – Dec 10
Zone 10a
Jan 1 – Dec 31
0
90
180
270
365 days
Frost Dates & Growing Season by County
View all 20 Ontario counties with frost dates
| County | Zone | Last Frost | First Frost | Growing Days |
|---|---|---|---|---|
| Algoma | 5b | Apr 24 | Oct 8 | 167 |
| Greater Sudbury | 5b | Apr 24 | Oct 8 | 167 |
| Grey-Bruce | 6a | Apr 20 | Oct 17 | 180 |
| Hamilton | 8a | Mar 26 | Nov 1 | 220 |
| Kenora | 4a | May 15 | Oct 2 | 140 |
| Kingston | 6b | Apr 13 | Oct 17 | 187 |
| Kitchener-Waterloo | 7a | Apr 10 | Oct 27 | 200 |
| London | 7b | Apr 3 | Oct 27 | 207 |
| Niagara | 8a | Mar 26 | Nov 1 | 220 |
| Nipissing | 5b | Apr 24 | Oct 8 | 167 |
| Ottawa | 6b | Apr 13 | Oct 17 | 187 |
| Peel (Mississauga/Brampton) | 7b | Apr 3 | Oct 27 | 207 |
| Peterborough | 6b | Apr 13 | Oct 17 | 187 |
| Sarnia-Lambton | 7b | Apr 3 | Oct 27 | 207 |
| Simcoe | 6b | Apr 13 | Oct 17 | 187 |
| Stormont-Dundas | 6a | Apr 20 | Oct 17 | 180 |
| Thunder Bay | 4b | May 7 | Oct 1 | 147 |
| Toronto | 7b | Apr 3 | Oct 27 | 207 |
| Wellington | 7a | Apr 10 | Oct 27 | 200 |
| Windsor-Essex | 8a | Mar 26 | Nov 1 | 220 |
🥬 Vegetables
Browse all 116 vegetables you can grow in Ontario
- Acorn Squash
- Amaranth
- Artichoke
- Arugula
- Asparagus
- Beets
- Belgian Endive
- Bitter Melon
- Black Beans
- Bok Choy
- Broccoli
- Broccoli Rabe
- Brussels Sprouts
- Butternut Squash
- Cabbage
- Calabash
- Cardoon
- Carrots
- Cauliflower
- Celeriac
- Celery
- Celtuce
- Chard
- Chayote
- Chickpeas
- Chicory
- Chinese Cabbage
- Christmas Lima Beans
- Collard Greens
- Corn
- Cowpeas
- Cress
- Crookneck Squash
- Crosne
- Cucumber
- Daikon
- Delicata Squash
- Edamame
- Eggplant
- Endive
- Escarole
- Fava Beans
- Fennel
- Garlic
- Ginger
- Green Beans
- Horseradish
- Hot Peppers
- Hubbard Squash
- Jicama
- Kabocha
- Kai Lan
- Kale
- Kidney Beans
- Kohlrabi
- Komatsuna
- Leeks
- Lentils
- Lettuce
- Lima Beans
- Loofah
- Luffa
- Mache
- Malabar Spinach
- Melon
- Microgreens
- Mitsuba
- Mizuna
- Mustard Greens
- Napa Cabbage
- New Zealand Spinach
- Okra
- Onion
- Pac Choi
- Parsnip
- Patty Pan Squash
- Peas
- Peppers
- Pole Beans
- Potatoes
- Pumpkin
- Purslane
- Radicchio
- Radish
- Rhubarb
- Romanesco
- Rutabaga
- Salsify
- Savoy Cabbage
- Scallions
- Scarlet Runner Beans
- Shallot
- Shiso
- Snap Peas
- Snow Peas
- Soybeans
- Spaghetti Squash
- Spinach
- Squash (Summer)
- Squash (Winter)
- Sunchoke
- Sunflower
- Sweet Corn
- Sweet Potatoes
- Tatsoi
- Tomatillo
- Tomatoes
- Turmeric
- Turnip
- Watercress
- Watermelon
- Wax Beans
- Winter Melon
- Yam
- Yard Long Beans
- Zucchini
🍓 Fruits
Browse all 34 fruits you can grow in Ontario
- Alpine Strawberries
- Aronia
- Blackberries
- Blueberries
- Boysenberries
- Cantaloupe
- Che Fruit
- Cranberries
- Currants
- Dragon Fruit
- Elderberries
- Figs
- Goji Berries
- Gooseberries
- Grapes
- Ground Cherry
- Guava
- Hardy Kiwi
- Haskaps
- Honeydew
- Jostaberry
- Kiwi
- Lingonberries
- Loquat
- Medlar
- Mulberries
- Passion Fruit
- Pawpaw
- Persimmon
- Pomegranate
- Quince
- Raspberries
- Serviceberries
- Strawberries
🌿 Herbs
Browse all 42 herbs you can grow in Ontario
- Angelica
- Anise
- Basil
- Bee Balm
- Borage
- Caraway
- Catnip
- Chamomile
- Chervil
- Chives
- Cilantro
- Comfrey
- Cumin
- Dill
- Echinacea
- Epazote
- Fennel (herb)
- Feverfew
- Garlic Chives
- Horehound
- Hyssop
- Lavender
- Lemon Balm
- Lemon Thyme
- Lemon Verbena
- Lemongrass
- Lovage
- Marjoram
- Mint
- Oregano
- Parsley
- Rosemary
- Rue
- Sage
- Savory
- Sorrel
- Stevia
- Tarragon
- Thai Basil
- Thyme
- Valerian
- Yarrow
Monthly Planting Guide for Ontario
The Gardener's Encyclopedia to Companion Planting
$27
$293 value
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners