GL Planters • USDA Zones • Frost Dates • Planting Calendar
USDA Hardiness Zones & Growing Seasons (2026 Guide)
Want to know when to plant in your area? Start with two things: your USDA Hardiness Zone (winter cold tolerance) and your frost-free growing season (last spring frost → first fall frost). This guide helps you plan a raised bed or planter garden with better timing, healthier plants, and more reliable harvests.
USDA Hardiness Zones
The USDA Plant Hardiness Zone Map divides the U.S. into 13 zones based on the average annual extreme minimum winter temperature. Each zone is a 10°F band (often split into “a/b” sub-zones). Use your zone to choose plants that can survive your winter—especially perennials and shrubs.
Quick answer: Your USDA zone helps you pick plants that survive winter. Your growing season comes from local frost dates and determines when to plant outdoors. For the best planting plan, use both.
Zone 1–3 (coldest)
Short season; prioritize cold-hardy crops and season extension for raised beds.
Zone 4–7 (common)
Great for spring greens + summer fruiting crops; plan 2–3 planting windows.
Zone 8–13 (warm)
Long season; succession planting and heat strategy can produce multiple harvests.
Next step: use your zone + frost dates to build a simple planting calendar, then choose a planter style that matches your space. Start browsing: all cedar planters & beds.
Growing seasons overview (frost-free planting window)
Best for planting schedulesYour frost-free growing season is the number of days between the last spring frost and the first fall frost. This determines when you can safely transplant warm-season crops (tomatoes, peppers) and how many rounds of greens, roots, and herbs you can grow each year.
| Region | Approx. frost-free window | Typical season length | Common USDA zones | Raised bed / planter strategy |
|---|---|---|---|---|
| Northern U.S. | May–Sep | ~90–150 days | 3–5 | Season extension + efficient spacing (raised beds warm faster in spring) |
| Midwest / Northeast | Apr–Oct | ~120–180 days | 4–7 | Cool → warm → fall rotation (greens → tomatoes/peppers → greens) |
| Pacific Northwest | Mar–Oct | ~150–200 days | 6–8 | Airflow + drainage focus (mildew management, consistent moisture) |
| Southeast | Mar–Nov | ~200–300 days | 7–10 | Succession planting + heat strategy (mulch, watering, timing) |
| Southwest | Feb–Dec | ~200–300+ days | 8–10 | Heat + irrigation plan (morning sun, afternoon shade, mulch) |
| Florida & SoCal | Year-round | Almost frost-free | 9–11+ | Multiple cycles per year (timing around heat & humidity) |
Related read: The Benefits of Raised Garden Beds (soil control, drainage, and better results across different climates).
Tips for success by zone (raised bed focused)
These strategies help you grow more reliably using best practices like extend the growing season in raised beds, improve airflow for disease prevention, and use succession planting where your climate allows.
Cold zones (1–4)
- Start earlier: use covers/cold frames to protect seedlings from late frosts.
- Warm soil faster: raised beds heat up quicker in spring than in-ground soil.
- Choose fast crops: lettuce, radish, peas, carrots (short-season varieties).
Temperate zones (5–7)
- Two-season plan: spring greens → summer fruiting crops → fall greens.
- Spacing + airflow: improves yields and reduces mildew and blight risk.
- Succession planting: sow every 2–3 weeks for continuous harvest.
Warm zones (8–11)
- Multiple cycles: plan spring, summer, and fall planting windows.
- Heat strategy: water early, mulch, and time sun exposure for tender plants.
- Pest pressure: use flowers and companion planting to support beneficial insects.
Tropical/subtropical (11–13)
- Year-round planning: prioritize airflow to reduce humidity-driven disease.
- Rotate crops: reduce pest cycles in continuous growing climates.
- Drainage matters: protect roots during heavy rain periods.
For sizing and layout comparisons, start here: Best elevated raised garden beds.
Planter picks by climate & space
Choose by how you garden: patio height, ground-level depth, or a large layout. These categories make it easy to match planter style to your growing season and space.
Patio-height planters
Comfort-height for herbs and vegetables; great for small spaces and frequent harvesting.
Deep ground beds
Ideal for deeper roots and larger crops—classic raised bed spacing and soil volume.
U-shaped layouts
Max planting area with easy reach—perfect for multi-crop rotation and big seasons.
See all planters
Browse every cedar planter and raised bed style in one place.
FAQs on growing seasons
What is the growing season in the USA?
The growing season is typically the time between the last killing frost in spring and the first killing frost in fall. The number of frost-free days varies widely by region.
Does my USDA zone tell me my frost dates?
Not exactly. USDA zones measure winter cold tolerance. Frost dates are local and depend on microclimates. Use your zone for plant survival and use frost dates for planting timing.
What is the best month to start growing?
It depends on your last frost date and what you’re planting (cool-season vs warm-season crops). Many gardeners begin with cool-season crops first, then transplant warm-season plants after frost risk drops.
How do raised beds help in short growing seasons?
Raised beds often warm faster in spring and drain better after rain, which can speed early growth. Pair that with covers/cold frames for stronger season extension.
Ready to pick the best bed for your zone? Start with the collection and compare sizes:
