Most trees get trimmed in the wrong season. I know this because they can’t complain about it afterward. (Huge advantage trees have over, say, teenagers with bad haircuts.) When should you trim trees? For most species in Surrey and the Fraser Valley, the answer is late January through early March.
That’s when the tree is fully dormant. Leaves are gone, so you can see the actual structure. Pests and pathogens are mostly dormant too. And pruning wounds seal fast once spring growth kicks in — which in Surrey typically starts late March or early April.
Quick answer: Late January to early March for most trees. Fruit trees want late February, just before bud break. Spring-blooming ornamentals go right after flowering. Oaks need November–March, no exceptions worth risking. Dead or dangerous branches: book now regardless of season.
The short answer — and why it’s that window
Three things happen in dormant season that don’t happen any other time of year, and all three make for a better job.
You can see what you’re cutting.No leaves means the branch structure is exposed. Dead branches, crossing limbs, weak attachments, and structural problems are obvious. Good trimming decisions start with a clear view. You don’t get that in August.
Pests and pathogens are mostly dormant. Fresh pruning cuts are entry points for disease. In dormant season, the insects and fungi that cause the most damage — bark beetles that carry oak wilt, fungal spores that cause canker — are significantly less active. Come April, that changes. The ISA’s arboricultural resources go into the disease-timing relationship in more detail if you want the science behind it.
Wounds heal fast.A cut made in February has the full spring flush of growth to begin closing over. Tree compartmentalisation — how trees respond to injuries — works best when the growth engine is just winding up. Wait until June and you’ve missed that window. The cut closes eventually, but slower and less cleanly.
Rule of thumb: if you’re not sure when to book, aim for late January or early February. Nine out of ten trees in the Fraser Valley will thank you for it.
Season-by-season breakdown for Surrey
Winter (November–February) — safest window for most species.This is when we book most trimming work, and the reason is simple: everything that makes the job better lines up at once. Trees are dormant, disease vectors are down, and the structure is fully visible. Surrey’s mild winters — rarely below -5°C — mean conditions are usually comfortable for ground and aerial work even in January.
Early spring (March) — still good, window narrowing.Once bud break arrives, things shift quickly. For maples, sap is moving by late February — trim then and you’ll get sap bleed. Not dangerous, just messy and stressful for the tree. For fruit trees, you actually want to time the cut to just before buds open — a precise window that’s easier to hit when you’ve scheduled ahead rather than scrambling.
Late spring and summer (April–August) — species-specific only.Spring-blooming trees (ornamental cherries, magnolias, forsythia) should be trimmed immediately after flowering — typically May to early June, before they set next year’s buds. Do it too late and you’ve cut off next spring’s bloom. For everything else, summer trimming is a second choice: the tree is under more water stress, wounds close slower, and it’s simply harder work in the heat.
Fall (September–October) — avoid for most trees.This is the window most often misunderstood. Trees are pulling stored resources back from leaves toward roots, preparing for dormancy. Trim in September and you’re prompting new growth at exactly the moment the tree is trying to shut down. That new growth won’t harden off before frost arrives. September and October pruning is genuinely stressful for most species — not fatal, but not a service to the tree.
Trees that need their own calendar
Most trees follow the dormant-season default. A few have specific requirements that override it.
Oaks. November through March, no exceptions worth risking. Outside that window, fresh cuts attract bark beetles that carry oak wilt fungus. Surrey’s Garry oaks — a native species and increasingly protected under the Surrey Tree Protection Bylaw — are particularly vulnerable. If your tree is past the November–March window, wait for next year. The risk to the tree isn’t worth the few months saved.
Fruit trees (apples, pears, plums, cherries). Late February to early March, just before bud break. That timing gives the tree structural improvement right before the push of spring growth — which means more vigorous fruiting wood. Fruiting cherry trees also have a useful summer window right after harvest — the fruiting cherry pruning guide covers that in detail.
Spring-blooming ornamentals(cherry blossoms, magnolias, forsythia). Prune these immediately after they finish flowering — typically May to early June. These trees set next year’s flower buds on this year’s new growth. Trim before they flower and you cut off the bloom.
Maples. Technically dormant-season pruning works, but maple sap moves fast from late January onward. The window where sap movement is minimal enough to avoid heavy bleeding is roughly November through mid-January. If you want the detailed maple pruning breakdown, our maple tree trimming guide has the full timing case.
Cedars and junipers.Late winter to early spring, before new growth. These don’t go fully dormant like deciduous trees, but they tolerate late-winter pruning well. Avoid heavy trimming in midsummer — the stress compounds with heat and water demand.
Dead, damaged, or dangerous — trim anytime
The calendar advice above applies to structural trimming: improving form, reducing crown weight, clearing crossings, managing size. Dead, diseased, or genuinely hazardous branches are a different category.
Remove those any time. A dead limb in August that’s hanging over a path doesn’t wait for a January booking. Same goes for storm damage — if a branch is resting on a structure or threatening one, that’s not a timing question, it’s a safety question. Get it dealt with.
The distinction: scheduled trimming (timing matters — book the right season) versus safety work(timing doesn’t — act now). If you’re not sure which category your situation is in, give us a call. That assessment costs nothing.
When not to call us for trimming
I’ll tell you this even though it costs us jobs.
If your tree is under 4–5 metres tall and in decent structural shape,you may not need an arborist. A good pruning saw and some basic technique covers a lot of ornamental cherries, young Japanese maples, and small fruit trees. The ISA publishes solid free guidance on basic pruning cuts — the “branch collar” method, specifically — that works for homeowners comfortable on a stable ladder at ground level.
If the tree hasn’t been trimmed in a few years and looks fine,it probably is fine. Not every tree needs annual trimming. Big established cedars, Douglas firs, and mature native maples often go five to ten years between professional touch-ups. Don’t trim a tree just because it’s there.
If it’s just about leaves and debris,that’s a gutters issue, not a trimming issue.
Do call us when: the crown is encroaching on a structure, branches are crossing and creating friction damage, you can’t safely reach the work zone from the ground, or the tree is over 6 metres and requires aerial work. Anything above pole-saw height is ours. Anything that requires a ladder on uneven ground near a structure is ours. Falls from ladders during tree work are a leading cause of serious injury in BC — the savings on a call-out fee are not worth that.
We’ll also tell you honestly if we arrive onsite and the tree doesn’t need what you booked. We won’t start cutting to justify the trip.
For the full breakdown on what professional trimming actually costs in Surrey, the tree trimming cost guide has real numbers by tree size and job type.