Which trees can you tap in Washington?

Bigleaf maple (Acer macrophyllum, native): Western Washington lowlands, Puget trough, Olympic Peninsula and Cascade foothills — 'the most prevalent maple in the Pacific Northwest' (research sites at Forks, Pe Ell, Bremerton, Quilcene, Acme, Sultan, Olympia, Eatonville) Boxelder (Acer negundo, native): 'naturalized in ... southeastern Washington' (FEIS); planted in towns east of the Cascades Rocky Mountain / Douglas maple (Acer glabrum, native): Mountains statewide; usually too small to tap Bigtooth maple (Acer grandidentatum, native): Listed for WA in FEIS states/provinces (marginal occurrence) Norway maple (Acer platanoides, introduced): Street tree across the state; FEIS lists it escaped in Washington Paper birch (Betula papyrifera, native): Northern and eastern Washington (FEIS WA in list); grows with bigleaf maple at Acme

Washington · beyond the maple belt

Can you make maple syrup in Washington?

Yes, in parts of itYes west of the Cascades: bigleaf maple is abundant, WSU/UW/OSU run a joint research-and-extension program, and a handful of permitted commercial producers (Acme, Whatcom County) sell bigleaf syrup — but sap is only 1–1.5% sugar, the season is a winter freeze-chasing game, and east of the Cascades the only tappable natives are boxelder and small mountain maples.

Local timing guidance

WSU Extension FAQ: 'In Western Washington, this is typically late November to early March, with the best sap runs occurring between late December and February.' Producer (Acme): 'Between December and early March ... McLeod must wait for a good freeze and thaw.'

Source: WSU Extension FAQ (VERIFIED); Cascadia Daily News 2025 (PRACTITIONER)

Trees

Tappable trees in Washington

Tappable tree species in Washington
Species	Status	Where
Bigleaf mapleAcer macrophyllum	native	Western Washington lowlands, Puget trough, Olympic Peninsula and Cascade foothills — 'the most prevalent maple in the Pacific Northwest' (research sites at Forks, Pe Ell, Bremerton, Quilcene, Acme, Sultan, Olympia, Eatonville)USFS FEIS (WA in states list); WSU Extension forest-farming page; Cascadia Daily/WSU case study
BoxelderAcer negundo	native	'naturalized in ... southeastern Washington' (FEIS); planted in towns east of the CascadesUSFS FEIS
Rocky Mountain / Douglas mapleAcer glabrum	native	Mountains statewide; usually too small to tapUSFS FEIS (WA in STATES list)
Bigtooth mapleAcer grandidentatum	native	Listed for WA in FEIS states/provinces (marginal occurrence)USFS FEIS
Norway mapleAcer platanoides	introduced	Street tree across the state; FEIS lists it escaped in WashingtonUSFS FEIS
Paper birchBetula papyrifera	native	Northern and eastern Washington (FEIS WA in list); grows with bigleaf maple at AcmeUSFS FEIS; WSU case study

Who already does it

Sugaring in Washington, documented

WSU Extension forest-farming guidance: bigleaf 'has a lower relative sugar content (1-1.5% by volume)'; 'maples are tapped in the winter months (Dec-Feb)'; labor 'restricted to a 3-4 weeks'; 'Reverse osmosis is essential for commercial syrup production'
Washington State University Extension (Western Region Landowner Program) · VERIFIED
WSU Bigleaf Maple Syrup Toolkit FAQ — season, depth, yields ('0.5-2 gallons per day'), spoilage and RO advice for hobbyists
WSU Extension · VERIFIED
UW thesis (Braun 2022), Pack Forest near Eatonville, three seasons under high vacuum: 'seasonal sugar content of tapped stems ranged from 0.7% to 1.9%, averaging 1.3%'; multi-stem clumps >30 cm 'produced two to three times more sap per tap'; sap (L) = 0.22 × DBH (cm) + 1.04
University of Washington ResearchWorks · VERIFIED
Neil's Bigleaf Maple Syrup, Acme (Whatcom County): 200-acre forest-farming case study by USDA National Agroforestry Center; 'Only three producers in the state, including the University of Washington, have cleared the bureaucratic hurdles' (Jan 2025)
WSU case study (USDA NAC); Cascadia Daily News, 25 Jan 2025 · PRACTITIONER
Neil's produced 140 gallons in 2019 and hoped for up to 700 in 2020; 'the sugaring season for bigleaf maples runs from October to March'
Modern Farmer, 9 Feb 2020 · PRACTITIONER

Cautions

What local sources warn about

Lean sap: 1–1.5% (WSU), 0.7–1.9% averaging 1.3% (UW) — roughly 80–100 gallons of sap per gallon of syrup; RO is 'essential' commercially. (WSU Extension; UW thesis (both VERIFIED))
Freezes are the limiting factor, not warmth: 'The length or intensity of freezing temperatures were insufficient to cause sap flow' is WSU's first troubleshooting item; Forks (wet west coast) was the one research site without commercial-grade flow. (WSU FAQ (VERIFIED); WSU magazine via search summary (RECALL))
Mild winters spoil sap fast — WSU: boil 'within 24-48 hours of it leaving the tree'; fridge buys 2–3 days; freezing stores it indefinitely. (WSU FAQ (VERIFIED))
Thick furrowed bark on old trees makes tapping harder; younger smooth-barked stems and clumps tap better. (UW thesis (VERIFIED); Raven's Roots (PRACTITIONER))

Where to look

Likely sugaring country

Acme (Whatcom County)
Neil's Bigleaf Maple Syrup — the state's largest producer, Nooksack valley cold-air drainage
Eatonville (Pierce County)
UW Pack Forest research sugarbush, three seasons of sap data
Olympia / Quilcene
WSU Meyer's Point station and Olympic Peninsula research sites with commercial-grade flow

Autosuggest priority place ('when to tap maple trees in washington state'). Selling rules (WA treats syrup as non-cottage food) noted in Cascadia Daily but out of scope. KUOW/NPR 2020 and WSU Magazine 2021 fetched but not quoted; research-site list from WSU Magazine is RECALL.

FAQ

Sugaring in Washington: questions

Can you tap maple trees in Washington?: Yes, in parts of it. Yes west of the Cascades: bigleaf maple is abundant, WSU/UW/OSU run a joint research-and-extension program, and a handful of permitted commercial producers (Acme, Whatcom County) sell bigleaf syrup — but sap is only 1–1.5% sugar, the season is a winter freeze-chasing game, and east of the Cascades the only tappable natives are boxelder and small mountain maples.
When do you tap maple trees in Washington?: WSU Extension FAQ: 'In Western Washington, this is typically late November to early March, with the best sap runs occurring between late December and February.' Producer (Acme): 'Between December and early March ... McLeod must wait for a good freeze and thaw.' (WSU Extension FAQ (VERIFIED); Cascadia Daily News 2025 (PRACTITIONER))
Which trees can you tap in Washington?: Bigleaf maple (Acer macrophyllum, native): Western Washington lowlands, Puget trough, Olympic Peninsula and Cascade foothills — 'the most prevalent maple in the Pacific Northwest' (research sites at Forks, Pe Ell, Bremerton, Quilcene, Acme, Sultan, Olympia, Eatonville) Boxelder (Acer negundo, native): 'naturalized in ... southeastern Washington' (FEIS); planted in towns east of the Cascades Rocky Mountain / Douglas maple (Acer glabrum, native): Mountains statewide; usually too small to tap Bigtooth maple (Acer grandidentatum, native): Listed for WA in FEIS states/provinces (marginal occurrence) Norway maple (Acer platanoides, introduced): Street tree across the state; FEIS lists it escaped in Washington Paper birch (Betula papyrifera, native): Northern and eastern Washington (FEIS WA in list); grows with bigleaf maple at Acme

Nearby

Other places beyond the belt

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