USDA hardiness zone lookup
Seattle (Fremont) (98103) — USDA Zone 8b
Seattle (Fremont), Washington · 233-day growing season
Frost dates and growing season for 98103
| USDA hardiness zone | Zone 8b |
|---|---|
| Average last spring frost | March 24 |
| Average first fall frost | November 12 |
| Growing season length | ~233 days |
| Temperature range (F) | 10 to 20°F |
| Temperature range (C) | -12 to -7°C |
These are 50%-probability averages modeled from this ZIP's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by March 24, but in a colder-than-average year it can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Seattle (Fremont)
Seattle (Fremont), Washington sits in USDA Zone 8b, with roughly 233 frost-free days between an average last spring frost around March 24 and a first fall frost around November 12. That is a long season — succession-sow through summer and run a full fall crop; heat-sensitive greens still need spring/autumn timing.
What grows in Seattle (Fremont)
Seattle (Fremont) falls in USDA Zone 8b, which means the same hardiness constraints apply as the full Zone 8 guide. Vegetables, herbs, and fruit trees rated to Zone 8b (or hardier) will overwinter here in a typical year.
- Tomatoes (spring + fall plantings)
- Peppers (sweet + hot)
- Okra
- Sweet potatoes
- Southern peas
- Melons, watermelon
- Figs
- Pomegranates
- Citrus (in protected spots — Meyer lemon)
- Pecans
What to plant in Seattle (Fremont) this week
Seattle (Fremont) is in the winter hold — outdoor planting is on pause. Use this time to plan, order seeds, and prep beds. Tomato and pepper seeds can start indoors 6-10 weeks before your last frost (March 24).
- When to plant tomatoes in zone 8
- When to plant peppers in zone 8
- When to plant basil in zone 8
- When to plant lettuce in zone 8
- When to plant peas in zone 8
Full planting calendar for Seattle (Fremont)
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 8 averages:
- When to plant tomatoes in zone 8
- When to plant peppers in zone 8
- When to plant basil in zone 8
- When to plant garlic in zone 8
- When to plant lettuce in zone 8
- When to plant bush beans in zone 8
- When to plant cucumbers in zone 8
- When to plant summer squash in zone 8
- When to plant peas in zone 8
- When to plant carrots in zone 8
Local microclimate notes
Zone tables give you the average — but Seattle (Fremont)gardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record (the last time you actually got frost damage) is more accurate than any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from this ZIP's USDA hardiness zone and regional NOAA 1991-2020 climate normals — they are zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations are drawn from US Cooperative Extension references and curated by the Growli editorial team. Last reviewed May 2026.
Nearby ZIP codes in Washington
- 98101 — Seattle (Zone 9a)
- 98109 — Seattle (Queen Anne) (Zone 9a)
- 98501 — Olympia (Zone 8b)
- 98401 — Tacoma (Zone 8b)
- 98201 — Everett (Zone 8b)
- 98225 — Bellingham (Zone 8b)
- 99201 — Spokane (Zone 7a)
- 98660 — Vancouver (Zone 8b)
- 98801 — Wenatchee (Zone 6b)
- 98105 — Seattle (University District) (Zone 9a)
- 98115 — Seattle (Wedgwood) (Zone 9a)
- 98118 — Seattle (Columbia City) (Zone 9a)
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