Port Alberni, British Columbia Garden Guide: Planting Dates, Frost Dates & Growing Season

Growing Season Snapshot

Typical last spring frost April 1

Typical first fall frost November 6

Typical frost-free days 219

GDD left on May 15 (base 50) 1442

These season boundaries are climate normals, not a forecast. A 50% frost date means a 32°F frost arrives by that date in about half of years — and later in about half. Treat these dates as planning anchors, not guarantees.

Port Alberni Planting Calendar

A practical guide to when planting usually works in Port Alberni. These windows are based on climate normals (not a forecast) and line up with the 50% last spring frost and typical early-season heat.

Crop	Planting Window	Method	Best Variety	Local Fit
Cool-season / early window Cold-tolerant crops that usually handle cooler spring conditions better.
Peas	March 4 – March 18	direct sow	Little Marvel	Excellent fit
Spinach	March 4 – March 18	direct sow	Space	Excellent fit
Kale	March 8 – March 28	direct sow / transplant	Winterbor	Excellent fit
Beets	March 11 – March 25	direct sow	Detroit Dark Red	Excellent fit
Carrots	March 11 – March 25	direct sow	Bolero	Excellent fit
Lettuce	March 11 – March 25	direct sow / transplant	Buttercrunch	Excellent fit
Onions	March 11 – March 25	sets / transplants	Redwing	Excellent fit
Strawberries	March 11 – March 25	plant crowns / transplants	Seascape	Excellent fit
Swiss Chard	March 12 – April 1	direct sow / transplant	Bright Lights	Excellent fit
Broccoli	March 18 – April 1	transplant	Packman	Excellent fit
Cabbage	March 18 – April 1	transplant	Stonehead	Excellent fit
Cauliflower	March 18 – April 1	transplant	Snow Crown	Excellent fit
Potatoes	March 18 – April 1	plant seed potatoes	Kennebec	Excellent fit
Main warm-season window Crops that usually do best once frost risk fades and the season starts opening up more fully.
Beans	April 1 – April 15	direct sow	Contender	Strong fit
Sweet Corn	April 6 – April 16	direct sow	Peaches and Cream	Strong fit
Basil	April 10 – April 20	direct sow / transplant	Genovese	Strong fit
Cucumbers	April 10 – April 20	direct sow / transplant	Marketmore 76	Strong fit
Melons	April 10 – April 20	direct sow / transplant	Hale's Best	Strong fit
Tomatoes	April 10 – April 20	transplant	Early Girl	Strong fit
Zucchini	April 10 – April 20	direct sow / transplant	Black Beauty	Strong fit
Pumpkin	April 10 – April 20	direct sow / transplant	Baby Bear	Good fit
Watermelons	April 10 – April 20	direct sow / transplant	Golden Midget	Good fit
Winter Squash	April 10 – April 20	direct sow / transplant	Honeyboat	Good fit
Peppers	April 17 – April 27	transplant	Gypsy	Good fit

How to use this: aim for the earlier part of each window for the most reliable results. Later planting can still work, but it usually depends more on variety maturity, warmer microclimates, and simple protection like row cover or low tunnels.

Common Timing Mistakes

These patterns show up again and again in Port Alberni — especially in typical years.

Planting everything at once instead of staggering crops across the season.
Relying on calendar dates instead of crop maturity and typical frost timing.

Missed Your Planting Window? What Can You Still Grow?

This table shows what can still mature from several later-season planting dates in Port Alberni. It compares the growing degree days still typically available after each checkpoint with the heat each crop usually needs to finish, then applies a 15% safety margin to separate crops that usually still fit from ones that are more borderline.

Usually fits Borderline Too tight

Crop	Heat Units	May 15	Jun 1	Jul 1	Aug 1
Spinach	450 (base 40)	✅	✅	✅	✅
Lettuce	500 (base 40)	✅	✅	✅	✅
Strawberry	600 (base 40)	✅	✅	✅	✅
Pea	600 (base 40)	✅	✅	✅	✅
Beet	650 (base 40)	✅	✅	✅	✅
Basil	700 (base 50)	✅	✅	✅	⚠️
Kale	700 (base 40)	✅	✅	✅	✅
Zucchini	750 (base 50)	✅	✅	✅	❌
Carrot	750 (base 40)	✅	✅	✅	✅
Swiss chard	750 (base 40)	✅	✅	✅	✅
Cucumber	800 (base 50)	✅	✅	✅	❌
Broccoli	900 (base 40)	✅	✅	✅	✅
Bean	900 (base 50)	✅	✅	✅	❌
Cabbage	1000 (base 40)	✅	✅	✅	✅
Cauliflower	1000 (base 40)	✅	✅	✅	✅
Sweet corn	1100 (base 50)	✅	✅	⚠️	❌
Potato	1100 (base 45)	✅	✅	✅	⚠️
Melon	1200 (base 50)	✅	⚠️	❌	❌
Tomato	1200 (base 50)	✅	⚠️	❌	❌
Pepper	1300 (base 50)	⚠️	⚠️	❌	❌
Onion	1300 (base 45)	✅	✅	✅	❌
Winter squash	1300 (base 50)	⚠️	⚠️	❌	❌
Pumpkin	1300 (base 50)	⚠️	⚠️	❌	❌
Watermelon	1350 (base 50)	⚠️	⚠️	❌	❌

Climate normals GDD planning

Compare your season’s typical heat accumulation against crop requirements before first fall frost.

Heat matters more than calendar days Use this when crop maturity depends on warmth, not just frost-free days. Especially useful for warm-season crops and short-season locations.

Best for borderline crops Especially useful for warm-season crops and short-season locations.

Check Crop Maturity and Timing in Port Alberni

Enter a ZIP / Postal Code in Port Alberni and your planting date to see whether different crops can typically mature before first fall frost.

ZIP / Postal

Crops

Select one or more crops.

Select Outdoor sow / Transplant date

How the Growing Season Works in Port Alberni

Port Alberni usually has a relatively forgiving season, but results still depend on how quickly gardens warm in spring and how well crop choices match local conditions.

Stagger planting dates: spreading sowings and transplanting windows often works better than planting everything at once.
Fall planting is more realistic: many areas still have enough runway for a meaningful second round of faster crops.
Summer management becomes the limiter: water, fertility, and pest pressure often matter more than season length alone.

Remaining Season Heat in Port Alberni (Base 50 GDD)

Growing Degree Days (Base 50°F) measure heat accumulation. “Remaining GDD” shows how much usable heat is typically still available from a given date onward in a normal season.

Planting date	Base	Typical GDD still available
May 15	50	1442
June 1	50	1369
July 1	50	1119
August 1	50	709

Use these values to judge whether a crop or variety still has enough heat left after planting. This is especially helpful for later sowings, shorter-maturity choices, and deciding whether a second round is realistic.

How Gardeners Adapt

Experienced gardeners in Port Alberni usually adjust their timing and crop choices to match how the season actually behaves, not just the calendar.

Using row cover or low tunnels to smooth out temperature swings early and late in the season.
Succession planting fast crops to keep beds productive through summer.
Watching local conditions closely and adjusting timing year by year.

Port Alberni Garden Planning Chart

A practical “typical year” for planning. Use it as a baseline, then adjust for microclimates and variety maturity.

Stage	What it usually means
Early season	Start cold-tolerant crops, prep beds, and pay more attention to soil warmth and night temperatures than to the calendar alone.
Main planting	Around April 1, the main planting push usually begins as frost risk fades. Warm-season crops generally perform best when they get established promptly.
Peak growth	This is when water, fertility, spacing, and pest pressure have the biggest effect on final yield.
Late-summer decisions	Second plantings can work, but success usually depends on maturity, microclimate, and how warm late summer stays.
Finish window	Plan to have frost-sensitive crops mostly wrapped up by November 6. Cooling nights often slow crops before the first real frost arrives.

Typical season length: 219 frost-free days between the median spring and fall frost dates.

Crop Guides for Port Alberni

Published crop-specific planting guides for Port Alberni, ordered from best fit to highest risk.

Excellent fit

Beets

Beets are usually one of the easier crops to grow here.

When to Plant Beets in Port Alberni

Broccoli

Port Alberni usually gives broccoli enough season that maturity is rarely the hard part.

When to Plant Broccoli in Port Alberni

Cabbage

Cabbage performs easily here in a typical year.

When to Plant Cabbage in Port Alberni

Carrots

This crop usually has enough season here that maturity is rarely the hard part.

When to Plant Carrots in Port Alberni

Cauliflower

Early and mid-season varieties usually fit comfortably here.

When to Plant Cauliflower in Port Alberni

Kale

Kale is usually one of the easier crops to grow here.

When to Plant Kale in Port Alberni

Lettuce

Port Alberni usually gives lettuce enough season that maturity is rarely the hard part.

When to Plant Lettuce in Port Alberni

Onions

Onions perform easily here in a typical year.

When to Plant Onions in Port Alberni

Peas

This crop usually has enough season here that maturity is rarely the hard part.

When to Plant Peas in Port Alberni

Potatoes

Very early to late varieties usually fit comfortably here.

When to Plant Potatoes in Port Alberni

Spinach

Spinach is usually one of the easier crops to grow here.

When to Plant Spinach in Port Alberni

Strawberries

Port Alberni usually gives strawberries enough season that maturity is rarely the hard part.

When to Plant Strawberries in Port Alberni

Swiss Chard

Swiss chard performs easily here in a typical year.

When to Plant Swiss Chard in Port Alberni

Strong fit

Basil

Basil is usually a dependable crop choice here.

When to Plant Basil in Port Alberni

Beans

Port Alberni usually gives beans enough season for reliable maturity.

When to Plant Beans in Port Alberni

Cucumbers

Cucumbers perform well here when planted on time.

When to Plant Cucumbers in Port Alberni

Melons

This crop usually gives gardeners some real room to work with.

When to Plant Melons in Port Alberni

Sweet Corn

Very early to late varieties usually fit well here.

When to Plant Sweet Corn in Port Alberni

Tomatoes

Tomatoes are usually a dependable crop choice here.

When to Plant Tomatoes in Port Alberni

Zucchini

Port Alberni usually gives zucchini enough season for reliable maturity.

When to Plant Zucchini in Port Alberni

Good fit

Peppers

Peppers are usually a practical crop here with good timing.

When to Plant Peppers in Port Alberni

Pumpkin

Pumpkin generally works well here when gardeners stay on schedule.

When to Plant Pumpkin in Port Alberni

Watermelons

Port Alberni usually gives watermelons enough season, but not much room for sloppy timing.

When to Plant Watermelons in Port Alberni

Winter Squash

This crop fits here, though slower choices still carry more risk.

When to Plant Winter Squash in Port Alberni

Looking for broader guidance? See planting timing across British Columbia

Port Alberni, British Columbia Garden Guide: Planting Dates, Frost Dates and Growing Season