Quick answer: Dahlia (Dahlia spp.) can grown in Camas, WA (USDA zone 8b, Pacific Northwest). Plant indoors 4 weeks before the last frost on Mar 25. Use a 5-gallon, 12" deep container with rich; well-drained loam; high in organic matter, pH 6.5–7. Water every 1-2 days at peak summer — Camas's cool Mediterranean climate is reasonably forgiving. Matures to 48" tall × 24" wide.
Why grow Dahlia in Camas?
Camas sits in USDA zone 8b (heat zone 5) with a Csb (cool Mediterranean) climate (Köppen-Geiger / VU Wien) — Pacific Northwest. Summer highs reach 82°F (NOAA NCEI) and winter lows fall to 34°F, at 692ft elevation (USGS). Dahlia prefers USDA zones 8–11, killed below 40°F. Dahlia fits the local zone window with normal container care. Surrounding metros — Washougal, Wood Village, and Troutdale — share the same climate, so this guide largely applies to them too.
The 225-day growing season (Mar 25 to Nov 10) gives you plenty of runway for dahlia, which take 90–120 days to mature. Camas averages 2600 hours of sunshine annually with 600 chill hours per winter — dahlia only need 6–10 hours daily, so light is never the problem. The game in Camas is matching variety to your local microclimate.
Metro-wide climate notes: Washougal and Wood Village sit in the same zone 8b cool Mediterranean basin as Camas, while Troutdale at slightly higher elevation runs 2-3°F cooler in winter. Gresham in the lower valley shares Camas's frost dates almost exactly. The dahlia growing strategies in this guide apply across the entire metro.
Also known as: Garden Dahlia · Family: Asteraceae · Perennial ornamental.
When to plant in Camas
Camas's climate gives you a clear dahlia window from spring through fall. Here are the dates that actually matter.
The Camas Dahlia calendar
- Start seeds indoors: 4 weeks before Mar 25
- Transplant outdoors (spring): After Mar 25 when soil temp ≥ 60°F
- First harvest: Mid-summer on early-maturing cultivars
- Peak production: Mid- to late summer
- Final harvest: Before Nov 10
Container setup for Camas
Dahlia needs a 5-gallon minimum, 12" deep container. Mature plants reach 48" tall × 24" wide.
Material warning for Camas: with 72% average humidity, drainage is the priority — non-breathable containers stay wet too long. Use:
- Fabric pots — air-prune roots, breathable
- Quality plastic with drainage — durable and affordable
- Glazed ceramic — attractive and stable
Soil: Rich; well-drained loam; high in organic matter, pH 6.5–7. Local soil: Camas's native soil is volcanic loam (matters for in-ground; containers use potting mix regardless).
Best dahlia varieties for Camas
Camas growers do well with these popular varieties (from breeders' lists). Pick by flavor and growth habit:
- Bishop of Llandaff (red with dark foliage)
- Cafe au Lait (huge creamy blush)
- Gallery Art Deco (compact patio)
- Karma Choc (dark cut flower)
- Topmix Red (dwarf patio)
Care routine for Camas
Water
Container-grown dahlia in Camas needs water every 1–2 days at peak summer. Dahlias are a Medium water-category plant with a baseline of every 2 days in containers. With only 46" of annual rainfall and 72% average humidity, weather provides regular help in summer thunderstorms. Camas has medium water restrictions — drip irrigation and morning watering (before 8am) are both efficiency-smart and rule-compliant.
Metro-wide note: Camas and surrounding Washougal, Wood Village, Troutdale all share regional water management, so the medium restriction schedule below applies regionally.
Fertilizer
Dahlias are a heavy feeder. Use a 10-20-20 (low-nitrogen, high-phosphorus/potassium) fertilizer once flowers appear. In containers, nutrients leach with every watering — feed weekly at half strength rather than monthly at full.
Sun
Dahlias need 6–10 hours of Full Sun. In Camas, morning sun with light afternoon protection during heat waves keeps plants productive without scorching.
Pests & diseases in Camas
Priority pests (Camas + Dahlia intersection)
Both dahlia and gardens in Camas are commonly affected by aphids; slugs; snails. These deserve weekly inspection — weekly inspection catches problems early.
Also watch for (dahlia-specific, less common locally): cucumber beetles; earwigs; spider mites; thrips.
Common dahlia diseases: powdery mildew; botrytis gray mold; tuber rot; viral mosaic; verticillium wilt. Camas's temperate climate carries moderate disease pressure; airflow and dawn watering keep most issues in check.
Companion plants & what to avoid
Good companions: zinnia; cosmos; salvia; rudbeckia; alyssum.
Avoid planting with: heavy feeders; tall plants that shade them.
Pollination: Dahlias are self-pollinating — a single plant will set fruit on its own.
Wildlife & pet safety
Deer pressure in Camas: high (urban metro). Dahlias are not deer-resistant — fencing recommended in higher-pressure suburbs.
Pet safety: Toxic to cats: Yes · Toxic to dogs: Yes. Toxic per ASPCA; mild gastrointestinal upset and skin dermatitis in cats and dogs
What it looks like in Camas
- Mature height: 48" tall
- Mature spread: 24" wide
- Growth habit: Upright
- Bloom months: Jul; Aug; Sep; Oct
- Foliage: Deciduous
- Wildlife value: bees; butterflies; pollinators attracted to open-centered varieties
Grower's tips for Dahlia
Plant tubers after last frost with eye facing up 4-6 inches deep; do not water until shoots emerge; stake tall varieties at planting to avoid spearing tubers; fertilize with low-nitrogen feed monthly; lift tubers after first frost blackens foliage and store in peat at 40-50 F
Common Camas dahlia mistakes
- Watering before sprouts emerge causing tuber rot.
- over-fertilizing nitrogen producing leaves not blooms.
- failing to stake leading to broken stems.
- not pinching center growth.
- storing tubers too warm or too dry over winter.
- Treating Camas's shoulder seasons like midsummer — variable spring and fall weather punishes calendar planting.
Camas dahlia FAQ
Does this Camas guide apply to Washougal, Wood Village, Troutdale?
Yes — Washougal, Wood Village, Troutdale, Gresham all share Camas's USDA zone 8b, Csb climate, and 225-day growing season. The varieties, planting calendar, and care advice in this guide apply across the entire metro. Subtle elevation differences shift frost dates by only a few days.
Can I grow dahlia year-round in Camas?
Camas's 225-day growing season covers spring through fall. Year-round only with indoor or protected cultivation in winter.
What's the best month to plant dahlia in Camas?
Transplant after the last frost on Mar 25 when soil temp at 4" reads ≥ 60°F. Start seeds indoors 4 weeks earlier.
Do I need a greenhouse for dahlia in Camas?
Not required, but a season-extension structure helps in shoulder months. Most Camas growers do fine with open-air containers.
How much sun do dahlia need in Camas?
Dahlias need 6–10 hours of direct sun. Camas delivers 2600 annual sunshine hours — plenty for full production with a south or west exposure.
What USDA zone is Camas?
Camas is in USDA hardiness zone 8b with AHS heat zone 5. Last frost typically Mar 25, first frost Nov 10, giving a 225-day growing season.
Where can I buy dahlia seedlings near Camas?
Check Camas's 1 farmers markets and local nurseries. Your state extension (https://extension.wsu.edu) lists certified suppliers and runs seasonal plant sales. 1 community gardens across the metro also share seedlings.
Are dahlia safe for my pets in Camas?
Toxic to cats: Yes; toxic to dogs: Yes. Toxic per ASPCA; mild gastrointestinal upset and skin dermatitis in cats and dogs Keep curious pets out of the container or use a cage.
How much water do dahlia use in Camas?
A 5-gallon container needs roughly 0.5–1 gallon per day in summer (sometimes 2 gallons during heat waves). Camas's medium water restrictions limit watering times, not amounts — drip irrigation and morning watering before 8am stays efficient and compliant. Rainfall averages 46" annually.
Camas gardening resources
- State extension: Washington Cooperative Extension
- Region: Pacific Northwest · Clark County, Washington · population 24,418
- Community gardens: approximately 1 across the Camas metro
- Farmers markets: 1 registered with USDA AMS
- Elevation: 692ft above sea level
- Nearby cities: Washougal gardening guide · Wood Village gardening guide · Troutdale gardening guide · Gresham gardening guide
Data sources
Climate, geographic, and toxicity data on this page come from public datasets. Cultivar profiles and growing recommendations draw on land-grant university extension research.
- USDA 2023 Plant Hardiness Zone Map (USDA Agricultural Research Service) — https://planthardiness.ars.usda.gov/ — Data via PRISM Climate Group, Oregon State University
- NOAA Climate Normals 1991-2020 (NOAA National Centers for Environmental Information) — https://www.ncei.noaa.gov/products/land-based-station/us-climate-normals
- Köppen-Geiger Climate Classification (US Counties) (Vienna University (TU Wien)) — https://koeppen-geiger.vu-wien.ac.at/usa.htm
- USGS Elevation Point Query Service (U.S. Geological Survey) — https://epqs.nationalmap.gov/
- USDA AMS National Farmers Market Directory (USDA Agricultural Marketing Service) — https://www.ams.usda.gov/local-food-directories/farmersmarkets
- ASPCA Toxic and Non-Toxic Plant List (American Society for the Prevention of Cruelty to Animals) — https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants
- Washington Cooperative Extension (Washington) — https://extension.wsu.edu