Washington
Planting zones in Grays Harbor County, Washington
This county spans USDA zones 8a to 9a, so there is no single zone for Grays Harbor County and anyone who gives you one is rounding. 60% of its ZIP codes are zone 8b; the rest are not.
Your ZIP code
Get the exact answer for your address
Everything above describes Grays Harbor County, Washington as a whole. Hardiness zones and freeze dates are published per ZIP code, so yours is exact — enter it and this page will tell you your zone, which NOAA station it comes from and how far away that station is.
Grays Harbor County does not have one planting answer
Its own weather stations disagree about 15 of the 32 crops in this table right now, so any single list would be wrong for part of the county. That is not a gap in the data — it is what the data says.
- Shortest season
- 169 days
ELMA, WA US (USC00452531) - Longest season
- 234 days
ABERDEEN, WA US (USC00450008)
65 days of growing season separate those two stations, and both serve ZIP codes in Grays Harbor County. The ZIP lookup above answers for one address instead of averaging a place that has no average.
Why the hardiness zone does not settle this
A USDA zone is a winter-minimum statistic. It was never a growing-season one, and it does not behave like one: within a single zone the growing season runs a median 54 days wider at the 10th–90th percentile, and annual growing degree days vary by 2.02×.
The zones also overlap rather than stack — 30% of zone 6b freezes before the median zone 6a station. The zone tells you what survives your winter; the station tells you what finishes before your autumn.
All 8 stations agreeAt least one station
Every one of the 8 NOAA stations serving this county counts May 1 – October 14 as growing season (166 days). Widening to any single station gives March 29 – November 15 (231 days).
That is a 65-day difference inside one county — which is why this page gives ranges rather than a single planting date. The ZIP lookup above resolves it to one station.
Which zone you are in depends where you are
Grays Harbor County covers 3 hardiness zones. A guide that gives the county one zone has picked whichever is largest and rounded everyone else into it — fine for the 60% in zone 8b and wrong for the other 40%. Here is the actual split.
| Zone | ZIP codes | Share | |
|---|---|---|---|
| 8b | 12 | 60% | |
| 9a | 6 | 30% | |
| 8a | 2 | 10% |
Zones are published per ZIP code, so yours is exact even though the county's is not. The hardiness tool will tell you which one you are in.
Your freeze dates
Across the 8 NOAA stations serving this county. These are medians — half of years freeze later than the date shown — so treat the later end of each range as the cautious one.
The growing season runs 169–234 days depending which station you are nearest, as published by NOAA rather than computed from the dates above. Summer highs average 65.6–76.7 °F in June–August. Summer rain over the same months runs 4.2–9.5" across those 8 stations, against the rough inch a week — about 13 inches over the same 92 days — that a vegetable garden is usually reckoned to want. The middle station covers about 38% of it, so expect to make up the rest. The inches are NOAA's published normals; the inch a week is a rule of thumb, and it takes no account of a 70 °F summer afternoon drying the soil faster than a cool one.
Every ZIP code in Grays Harbor County
Zones are published per ZIP code, not per county, so this is the exact answer rather than the county's average. The station column is the nearest one to that ZIP code's centroid and how far away it is — the same figure the tools use, shown here so you can see which ZIP codes are well covered and which are reaching.
| ZIP code | USDA zone | Nearest NOAA station | Distance |
|---|---|---|---|
| 98520 | 8b | Aberdeen, WA | 2.5 km |
| 98526 | 8b | Quinault 4 NE, WA | 14.4 km |
| 98535 | 9a | Humptulips Salmon Hatchery, WA | 17.4 km |
| 98536 | 9a | Humptulips Salmon Hatchery, WA | 9.7 km |
| 98537 | 8b | Raymond 2 S, WA | 20.5 km |
| 98541 | 8b | Elma, WA | 5.8 km |
| 98550 | 8b | Humptulips Salmon Hatchery, WA | 14.4 km |
| 98552 | 8b | Humptulips Salmon Hatchery, WA | 9.7 km |
| 98557 | 8a | Elma, WA | 10.6 km |
| 98559 | 8b | Elma, WA | 7.9 km |
| 98562 | 9a | Humptulips Salmon Hatchery, WA | 15.9 km |
| 98563 | 8b | Aberdeen 20Nne, WA | 9.7 km |
| 98566 | 8b | Quinault 4 NE, WA | 16.8 km |
| 98568 | 8a | Elma, WA | 18.0 km |
| 98569 | 9a | Hoquiam Bowerman AP, WA | 16.3 km |
| 98571 | 9a | Humptulips Salmon Hatchery, WA | 16.1 km |
| 98575 | 8b | Quinault 4 NE, WA | 6.7 km |
| 98583 | 8b | Elma, WA | 6.6 km |
| 98587 | 8b | Humptulips Salmon Hatchery, WA | 15.8 km |
| 98595 | 9a | Grayland, WA | 10.8 km |
ZIP-code positions are area centroids, so a large rural ZIP code's listed distance is measured from the middle of its area rather than from any particular address in it.
When to start seeds in Grays Harbor County
Every date below is anchored on the last spring freeze at each station and reported as a range across all 8 of them, because no one station speaks for the county.
| Crop | Job | When | Offset |
|---|---|---|---|
| 🧅 Green Onions | Start indoors | February 1 – March 6 | 8 wk before |
| 🌶️ Peppers | Start indoors | February 1 – March 6 | 8 wk before |
| 🥦 Broccoli | Start indoors | February 15 – March 20 | 6 wk before |
| 🥬 Cabbage | Start indoors | February 15 – March 20 | 6 wk before |
| 🥬 Collards | Start indoors | February 15 – March 20 | 6 wk before |
| 🥬 Kale | Start indoors | February 15 – March 20 | 6 wk before |
| 🥬 Leaf Lettuce | Start indoors | February 15 – March 20 | 6 wk before |
| 🫛 Peas | Direct sow | February 15 – March 20 | 6 wk before |
| 🥬 Spinach | Direct sow | February 15 – March 20 | 6 wk before |
| 🍠 Sweet Potato | Start indoors | February 15 – March 20 | 6 wk before |
| 🍅 Tomatoes | Start indoors | February 15 – March 20 | 6 wk before |
| 🥬 Bok Choy | Start indoors | February 22 – March 27 | 5 wk before |
| 🥬 Kohlrabi | Start indoors | February 22 – March 27 | 5 wk before |
| 🥬 Swiss Chard | Start indoors | February 22 – March 27 | 5 wk before |
| 🥬 Arugula | Direct sow | March 1 – April 3 | 4 wk before |
| 🥬 Baby Salad Greens | Direct sow | March 1 – April 3 | 4 wk before |
| 🥕 Beets | Direct sow | March 1 – April 3 | 4 wk before |
| 🧅 Green Onions | Direct sow | March 1 – April 3 | 4 wk before |
| 🥬 Mustard Greens | Direct sow | March 1 – April 3 | 4 wk before |
| 🌶️ Okra | Start indoors | March 1 – April 3 | 4 wk before |
| 🌱 Radishes | Direct sow | March 1 – April 3 | 4 wk before |
| 🥔 Turnips | Direct sow | March 1 – April 3 | 4 wk before |
| 🥬 Cabbage | Set out | March 8 – April 10 | 3 wk before |
| 🥕 Carrots | Direct sow | March 8 – April 10 | 3 wk before |
| 🥬 Collards | Direct sow | March 8 – April 10 | 3 wk before |
| 🥬 Collards | Set out | March 8 – April 10 | 3 wk before |
| 🥒 Cucumbers | Start indoors | March 8 – April 10 | 3 wk before |
| 🧅 Green Onions | Set out | March 8 – April 10 | 3 wk before |
| 🥬 Kale | Direct sow | March 8 – April 10 | 3 wk before |
| 🥬 Kale | Set out | March 8 – April 10 | 3 wk before |
| 🥬 Kohlrabi | Direct sow | March 8 – April 10 | 3 wk before |
| 🥬 Kohlrabi | Set out | March 8 – April 10 | 3 wk before |
| 🥬 Leaf Lettuce | Direct sow | March 8 – April 10 | 3 wk before |
| 🎃 Pumpkins | Start indoors | March 8 – April 10 | 3 wk before |
| 🎃 Summer Squash | Start indoors | March 8 – April 10 | 3 wk before |
| 🎃 Winter Squash | Start indoors | March 8 – April 10 | 3 wk before |
| 🥒 Zucchini | Start indoors | March 8 – April 10 | 3 wk before |
| 🥬 Bok Choy | Direct sow | March 15 – April 17 | 2 wk before |
| 🥬 Bok Choy | Set out | March 15 – April 17 | 2 wk before |
| 🥦 Broccoli | Set out | March 15 – April 17 | 2 wk before |
| 🌿 Cilantro | Direct sow | March 15 – April 17 | 2 wk before |
| 🥬 Leaf Lettuce | Set out | March 15 – April 17 | 2 wk before |
| 🥬 Swiss Chard | Direct sow | March 15 – April 17 | 2 wk before |
| 🥬 Swiss Chard | Set out | March 15 – April 17 | 2 wk before |
| 🌿 Dill | Direct sow | March 22 – April 24 | 1 wk before |
| 🫘 Bush Beans | Direct sow | April 5 – May 8 | 1 wk after |
| 🥒 Cucumbers | Set out | April 5 – May 8 | 1 wk after |
| 🎃 Pumpkins | Direct sow | April 5 – May 8 | 1 wk after |
| 🎃 Pumpkins | Set out | April 5 – May 8 | 1 wk after |
| 🎃 Summer Squash | Direct sow | April 5 – May 8 | 1 wk after |
| 🎃 Summer Squash | Set out | April 5 – May 8 | 1 wk after |
| 🌽 Sweet Corn | Direct sow | April 5 – May 8 | 1 wk after |
| 🍅 Tomatoes | Set out | April 5 – May 8 | 1 wk after |
| 🎃 Winter Squash | Direct sow | April 5 – May 8 | 1 wk after |
| 🎃 Winter Squash | Set out | April 5 – May 8 | 1 wk after |
| 🥒 Zucchini | Direct sow | April 5 – May 8 | 1 wk after |
| 🥒 Zucchini | Set out | April 5 – May 8 | 1 wk after |
| 🥒 Cucumbers | Direct sow | April 12 – May 15 | 2 wk after |
| 🌶️ Okra | Direct sow | April 12 – May 15 | 2 wk after |
| 🌶️ Okra | Set out | April 12 – May 15 | 2 wk after |
| 🌶️ Peppers | Set out | April 12 – May 15 | 2 wk after |
| 🫘 Southern Peas | Direct sow | April 12 – May 15 | 2 wk after |
| 🍠 Sweet Potato | Set out | April 12 – May 15 | 2 wk after |
Offsets are published guidance; the dates they land on are computed from measured NOAA normals. The seed-starting tool does this for your own ZIP code and counts the days.
What survives the winter changes across Grays Harbor County
Zone 8a carries 57 of 74 perennial edibles; zone 9a carries 46. The best number is not always the warmest zone — the count peaks in the middle and falls both ways, because the warm end loses plants to insufficient winter chill and summer heat, not to cold.
Hardiness ranges are a judgement, published by growers rather than measured; the zone they are compared against is measured. On a warm-end verdict, check with your local extension service — a coastal zone 8 and an inland zone 8 are not the same summer.
Cautious — shortens the seasonMedian across stationsOptimistic
- Last spring freeze
- Plan to May 19 to be careful. Median March 29 – May 1 across 8 stations; February 25 is the optimistic end.
- First fall freeze
- Plan to September 29 to be careful. Median October 14 – November 15 across 8 stations; December 10 is the optimistic end.
NOAA publishes these as probabilities, not averages — the middle figure is a median, so half of years fall either side of it. The cautious end is the 10% tail: in roughly nine years in ten the freeze falls on the safe side of it.
The 8 stations behind these numbers
All 8 NOAA stations whose normals this page quotes, spanning about 96 km north to south. Every one is named with its identifier in the station list below — this page does not single one out, because no one station speaks for a whole county.
A relative sketch, not a map with a projection: longitude is adjusted for latitude so the shape is not stretched, and there is no basemap. For the one station nearest a specific address, with its real distance, use the ZIP lookup above.
These are the stations this county's ZIP codes actually cite as nearest — not a claim that each one sits inside its boundary, since a rural ZIP legitimately reaches over it. Every figure above comes from them, and each is named so you can check it.
| Station | NOAA ID | Last spring freeze | First fall freeze | Season |
|---|---|---|---|---|
| Aberdeen 20Nne, WA | USC00450013 | April 15 | November 2 | 200 days |
| Aberdeen, WA | USC00450008 | March 29 | November 15 | 234 days |
| Elma, WA | USC00452531 | May 1 | October 14 | 169 days |
| Grayland, WA | USC00453320 | March 29 | November 7 | 224 days |
| Hoquiam Bowerman AP, WA | USW00094225 | March 30 | November 14 | 228 days |
| Humptulips Salmon Hatchery, WA | USC00453826 | April 26 | October 22 | 180 days |
| Quinault 4 NE, WA | USW00004237 | April 7 | November 10 | 214 days |
| Raymond 2 S, WA | USC00456914 | April 26 | October 17 | 177 days |
These are medians, not averages — NOAA publishes freeze dates as a probability distribution, and half of years freeze later than the date shown.
Your own ZIP
Work out your own dates
This page describes a whole county. Every tool below answers for one ZIP code, which is the grain the underlying data is published at.
Other places to compare
Grays Harbor County sits in Washington. That page carries the whole state's zone spread, its metro areas, and every other county in it with a page here.
More of Washington
- Whitman County, WA 6b–7a
- Okanogan County, WA 6a–7b
- Grant County, WA 6b–7b
- Klickitat County, WA 7a–8a
- Pacific County, WA 8a–9b
- Lincoln County, WA 6b–7a
- Kittitas County, WA 6b–7a
- Ferry County, WA 6a–7a
- Mason County, WA 8b
- Clallam County, WA 8b–9a
- Island County, WA 8b
- Adams County, WA 6b–7a
Gear
If you want to act on this
Each link opens an Amazon search rather than a product we picked. We have not tested these and do not rank them — the search is the honest version, and you choose.
- Row cover and frost clothThe season here closes at the first fall freeze dated above — a cover buys back some of those days at the end.
- MulchFor the perennials nearest their cold limit in zone 8a, where an insulated crown is what decides whether they come back.
As an Amazon Associate we earn from qualifying purchases. That costs you nothing extra, and it buys no influence over anything on this site: the dates come from NOAA normals and the zones from the USDA, and no product affects either.
Sources
Where these numbers come from
Hardiness zones are the USDA 2023 Plant Hardiness Zone Map, published per ZIP code by PRISM at Oregon State. Freeze dates and growing-season lengths are NOAA 1991–2020 Climate Normals, taken per station and cited above by name and NOAA ID.
County boundaries come from the Census ZCTA-to-county relation, which is what places each ZIP code — and which treats parishes, boroughs and census areas as county equivalents. No station is chosen to represent this county: every range above is taken across all of them and the count is stated, because picking one would be a judgement dressed as a measurement.