When to Plant Cauliflower in Vancouver, WA
Published: April 24, 2026
Cauliflower Planting Dates for Vancouver, WA
| Start seeds indoors | April 2–9 |
| Last frost (average) | May 7 |
| Transplant outdoors | April 16–26 |
| Minimum soil temperature | 45°F |
| Expect first harvest | June 10 – July 25 |
| Fall crop planting | July 23–August 2 |
| Fall crop harvest | September 16 |
| First fall frost (average) | October 1 |
⚠ Start cauliflower indoors 4–6 weeks before last frost. Transplant 2–4 weeks before last frost. Needs consistent moisture and cool temps — bolts in heat above 75°F.
Best Cauliflower Varieties for Vancouver, WA
Consult a Vancouver-area nursery or your state extension office for cauliflower varieties proven in Zone 4b.
Growing Cauliflower in Vancouver
Vancouver sits in Zone 4b, with an average last frost of May 7 and first fall frost around October 1 — giving a 147-day frost-free growing season. Cool-season crops like cauliflower benefit from Vancouver's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Vancouver's cooler summers are close to ideal for cauliflower. The same conditions that limit tomato and pepper yields benefit cool-season crops — slower bolting, sweeter flavor, and longer harvest windows. The fall cauliflower crop in Vancouver is often more productive than the spring crop.
Vancouver's well-draining loam soils are among the best for cauliflower growing — focus on annual organic matter additions (2 to 3 inches of compost) and consistent moisture during drier months. Water cauliflower at 1.5 inches per week; loam holds moisture evenly without the drought-crack cycle of heavy clay or the rapid-drain losses of pure sand.
Cauliflower Calendar for Vancouver
| Month | Task |
|---|---|
| April | Start seeds indoors under grow lights |
| May | Last frost — harden off seedlings outdoors |
| April | Transplant outdoors into warm soil |
| June | Expect first harvest window to open |
| July | Start fall crop — transplants or direct sow |
| October | First fall frost — harvest remaining, end of outdoor season |
Cauliflower Tips for Vancouver Gardeners
- •Blanch white varieties by tying outer leaves over the head when it reaches egg-size — prevents yellowing from sun exposure.
- •Keep soil evenly moist — drought stress causes small, bitter 'buttoning' heads instead of full curds.
- •Fall plantings in Vancouver often out-produce spring plantings — cooler temperatures slow bolting and concentrate flavor. Light frost can actually improve the taste of cauliflower.
Common Cauliflower Pests in Vancouver
- •Cabbage Worm — peaks July in Zone 4b (active June–August); green caterpillars on brassicas; apply Bt spray or use row covers.
- •Cabbage Looper — peaks July in Zone 4b (active June–August); loop-walking green caterpillars; Bt spray works well.
- •Aphid — peaks July in Zone 4b (active June–August); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Cauliflower in Vancouver
In Vancouver's cold climate, Onion and Celery are the most beneficial plants to grow alongside cauliflower. Onion deters carrot fly, aphids, and several root-zone pests through sulfur compounds. Keep cauliflower away from Tomato — it competes for nutrients or shares pest pressure. In short-season gardens, interplanting companions at transplant time maximizes each bed's productive weeks.
Frequently Asked Questions
When should I plant cauliflower in Vancouver, WA?
In Vancouver (Zone 4b), start cauliflower seeds indoors around April 2–9 and transplant outdoors around April 16–26. The city's average last frost of May 7 is the anchor date — count 5 weeks back for seed starting and 3 weeks back for transplanting.
What zone is Vancouver, WA for cauliflower growing?
Vancouver is USDA Zone 4b. For cauliflower, this means a frost-free growing season of roughly 21 weeks running from May 7 to October 1. Cool-season crops like cauliflower thrive in this zone with both spring and fall planting windows available.
When is cauliflower harvest season in Vancouver?
Expect the first cauliflower harvest in Vancouver around June 10, with harvest continuing through July 25. This is based on 55–100 days from transplant or direct sow. A fall crop planted July 23–August 2 adds a second harvest around September 16.
How long does it take to grow cauliflower in Vancouver, WA?
From transplant or direct sow to first harvest, cauliflower takes 55–100 days in Vancouver's climate. Based on a typical planting date of April 16–26, expect your first harvest around June 10. Vancouver's cooler Zone 4b climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does cauliflower need in Vancouver?
Vancouver's loam soil is near-ideal for cauliflower. Work in 2–3 inches of compost before planting to boost organic matter and nutrient content. Minimal amendment is needed beyond that — loam holds moisture evenly without the drought-crack cycle of clay or the nutrient-loss issues of sandy soil.