City	Plant out	Last frost
Seattle	Feb 8 to Feb 22	Mar 8
Spokane	Mar 29 to Apr 12	Apr 26
Tacoma	Feb 8 to Feb 22	Mar 8
Vancouver	Mar 1 to Mar 15	Mar 29
Bellevue	Feb 8 to Feb 22	Mar 8
Kent	Feb 20 to Mar 6	Mar 20
Everett	Feb 24 to Mar 10	Mar 24
Spokane Valley	Mar 29 to Apr 12	Apr 26
Renton	Feb 13 to Feb 27	Mar 13
Federal Way	Feb 8 to Feb 22	Mar 8
Yakima	Mar 11 to Mar 25	Apr 8
Kirkland	Feb 8 to Feb 22	Mar 8
Bellingham	Mar 4 to Mar 18	Apr 1
Kennewick	Feb 28 to Mar 14	Mar 28
Auburn	Feb 20 to Mar 6	Mar 20
Pasco	Mar 30 to Apr 13	Apr 27
Redmond	Feb 8 to Feb 22	Mar 8
Marysville	Feb 24 to Mar 10	Mar 24
South Hill	Mar 14 to Mar 28	Apr 11
Shoreline	Feb 8 to Feb 22	Mar 8
Sammamish	Mar 2 to Mar 16	Mar 30
Richland	Mar 9 to Mar 23	Apr 6
Lakewood	Feb 11 to Feb 25	Mar 11
Lacey	Apr 1 to Apr 15	Apr 29
Olympia	Apr 1 to Apr 15	Apr 29
Bothell	Feb 8 to Feb 22	Mar 8
Burien	Feb 2 to Feb 16	Mar 2
Bremerton	Mar 1 to Mar 15	Mar 29
Edmonds	Feb 9 to Feb 23	Mar 9
Puyallup	Mar 14 to Mar 28	Apr 11
Lynnwood	Feb 9 to Feb 23	Mar 9
Lake Stevens	Feb 24 to Mar 10	Mar 24
Issaquah	Feb 13 to Feb 27	Mar 13
Parkland	Feb 8 to Feb 22	Mar 8
Longview	Mar 11 to Mar 25	Apr 8
Wenatchee	Mar 7 to Mar 21	Apr 4
University Place	Feb 11 to Feb 25	Mar 11
Mount Vernon	Feb 24 to Mar 10	Mar 24
Graham	Mar 14 to Mar 28	Apr 11
SeaTac	Feb 2 to Feb 16	Mar 2
Spanaway	Mar 14 to Mar 28	Apr 11
Walla Walla	Feb 27 to Mar 13	Mar 27
Pullman	Apr 8 to Apr 22	May 6
Des Moines	Feb 2 to Feb 16	Mar 2
Orchards	Mar 29 to Apr 12	Apr 26
Maple Valley	Mar 23 to Apr 6	Apr 20
Tumwater	Apr 1 to Apr 15	Apr 29
Camas	Feb 16 to Mar 2	Mar 16
Moses Lake	Mar 30 to Apr 13	Apr 27
Mill Creek East	Feb 9 to Feb 23	Mar 9
Mountlake Terrace	Feb 8 to Feb 22	Mar 8
Mercer Island	Feb 13 to Feb 27	Mar 13
Bainbridge Island	Mar 1 to Mar 15	Mar 29
Kenmore	Feb 8 to Feb 22	Mar 8
Frederickson	Mar 14 to Mar 28	Apr 11
Oak Harbor	Feb 13 to Feb 27	Mar 13
North Lynnwood	Feb 9 to Feb 23	Mar 9
Battle Ground	Mar 29 to Apr 12	Apr 26
Eastmont	Feb 9 to Feb 23	Mar 9
Union Hill-Novelty Hill	Feb 8 to Feb 22	Mar 8
Cottage Lake	Mar 20 to Apr 3	Apr 17
Hazel Dell	Mar 29 to Apr 12	Apr 26
Martha Lake	Feb 9 to Feb 23	Mar 9
Bonney Lake	Mar 14 to Mar 28	Apr 11
Arlington	Mar 25 to Apr 8	Apr 22
Tukwila	Feb 2 to Feb 16	Mar 2
Silver Firs	Feb 9 to Feb 23	Mar 9
Covington	Mar 23 to Apr 6	Apr 20
Five Corners	Mar 29 to Apr 12	Apr 26
Ellensburg	Apr 10 to Apr 24	May 8
Mukilteo	Feb 9 to Feb 23	Mar 9
Silverdale	Mar 1 to Mar 15	Mar 29
Bothell West	Feb 9 to Feb 23	Mar 9
Mill Creek	Feb 9 to Feb 23	Mar 9
Port Angeles	Feb 12 to Feb 26	Mar 12
Monroe	Mar 20 to Apr 3	Apr 17

Questions

When should I plant asparagus in Washington?

In Seattle, plant out from February 8 to February 22. Across Washington the window opens between February 2 and April 10, depending on the local last frost.

How is this date worked out?

Set out crowns 2–4 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.