USDA hardiness zone lookup
Renton (98055) — USDA Zone 8b
Renton, Washington · 221-day growing season
Frost dates and growing season for 98055
| USDA hardiness zone | Zone 8b |
|---|---|
| Average last spring frost | March 30 |
| Average first fall frost | November 6 |
| Growing season length | ~221 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 30, 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 Renton
Renton, Washington sits in USDA Zone 8b, with roughly 221 frost-free days between an average last spring frost around March 30 and a first fall frost around November 6. 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 Renton
Renton 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 Renton this week
Renton 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 30).
- 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 Renton
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 Rentongardens 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)
- 98103 — Seattle (Fremont) (Zone 8b)
- 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)
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