Outdoor Lighting Maintenance Checklist: Annual and Seasonal Tasks

A well-installed landscape lighting system needs less maintenance than most homeowners think, but the maintenance it does need has to actually happen. Skip the annual checks and small issues — a corroded connection, a fixture pushed off-aim by a mower, a transformer running hot — turn into expensive failures within a couple of seasons.

This is the maintenance checklist we walk through twice a year on every system we service. It takes 60–90 minutes for a typical residential install and prevents almost every common landscape lighting failure.

Spring Inspection (March or April)

Spring is the priority visit. Winter is hard on outdoor fixtures — freeze-thaw cycles loosen fixtures from their stakes, snow plows shift cables, and ice on connections accelerates corrosion. Do these checks first thing each year before the system has run through a full season.

1. Walk Every Fixture in Daylight

Look for fixtures that are leaning, partially buried by mulch settling, knocked sideways by snow, or visibly corroded. Straighten leaning fixtures, clear mulch back from lenses, and replace any fixture showing more than light surface patina on the housing. Brass and copper develop natural patina that's fine — flaking, pitting, or green crusty buildup is not, and means moisture is getting inside.

2. Clean Every Lens

Lenses develop a thin film of mineral deposits, pollen, sap, and dust every season. A clean lens throws 20–30% more light than a dirty one — meaning a properly maintained system at 4 watts per fixture outperforms a neglected system at 6 watts. Wipe each lens with a damp microfiber cloth and a drop of dish soap. Don't use glass cleaner; it can damage gaskets over time.

3. Check Connections at Every Hub

Open each waterproof hub connection and inspect for moisture intrusion, corrosion on the wire ends, or loose connections. Quality gel-filled hubs almost never need attention, but if you find one with visible water or oxidation, replace it. Pierce-point connectors should be checked even more carefully — they fail more often than they don't, which is why we always replace them with hub connections during any service visit.

4. Test the Transformer

Open the transformer cabinet and look for signs of heat damage (discoloration on the case, melted wire insulation, a hot-electronics smell). Check that the timer or photocell is set correctly for the current season's sunset. Verify the voltage taps are still on the right settings for each zone — sometimes settings drift if the cabinet is bumped or chewed by rodents.

5. Test the Full System After Dark

Once daylight tasks are done, come back at full dark and turn the system on. Walk the entire property and note any fixture that is dim, dark, or aimed wrong. Re-aim what's been knocked off. Replace failed bulbs. Note any consistently dim zones — that's a sign of voltage drop and may need a tap adjustment or a cable upgrade.

Fall Inspection (September or October)

Fall is the lighter visit. The goals are to prepare the system for the season when it'll run the most (long dark evenings) and catch any wear from a full summer of growth.

1. Trim Around Every Fixture

Plants grow into fixtures all summer. Trim back any foliage blocking lenses or growing through path light apertures. Pay special attention to up-lights aimed at trees — a fixture aimed perfectly at the trunk in April is often aimed at a wall of new foliage by September.

2. Adjust Aim on Tree Up-Lights

Trees grow visibly between spring and fall. Re-aim every tree up-light to follow the new canopy height and spread. This is the single biggest reason landscape lighting looks worse in year three than in year one — nobody re-aims the up-lights and the design slowly drifts off-target.

3. Update Timer Settings

If you're running an astronomic timer, it'll adjust automatically for sunset shifts. If you're running a fixed-time timer or a photocell, reset it for the shorter fall and winter evenings. A system that turns on at 7:30pm in summer should be turning on at 5:00pm by November.

4. Inspect Cable Runs Where Visible

Walk the property looking for any exposed cable that's been pulled out of the ground by frost, lawn equipment, or animals. Rebury or re-clip as needed. Exposed low-voltage cable isn't a safety hazard but it will fail faster from UV and physical damage.

Annual Tasks (Once Per Year)

These don't need to happen on a strict schedule — once a year is enough — but they should make it onto the list.

- Replace any LED bulb that's noticeably dimmer than its neighbors (5–10% of bulbs annually on a typical system) - Replace the transformer's lithium backup battery (powers the timer through outages) - Re-torque every fixture mounting screw — vibration loosens them over years - Photograph the system at night for reference; you'll be glad to have a baseline when something changes

When to Call a Professional

Most spring and fall checklist items are DIY-friendly. Call a professional when:

- An entire zone goes dark (likely cable damage or transformer tap failure) - The transformer is humming audibly or running hot to the touch (overload or end-of-life) - More than 10% of fixtures are dim or failed in a single season (systemic issue, not random bulb failures) - You see any 120V line-voltage fixture exposed by erosion, root damage, or grade change (immediate code and safety issue)

Annual professional service for a typical residential landscape lighting system runs $250–$500 in 2026 and is worth it for any homeowner who values the design enough to maintain it properly.