Sailboat Spring Commissioning: Rig, Sails, Bottom, Engine and First Sail
A sailboat-specific spring checklist: inspect the rig before it goes up, bend on the sails, check through-hulls and the bottom, recommission the diesel or saildrive, bring the head and freshwater back, test electronics and safety gear, and shake it all down on a first sail. Each system links to its detailed BoatMend guide.
Time
8 h
Shop would charge
$500-1500
Applies to
All engines · Sailboat
Safety first: Never stand under a boat in the slings or a mast on a crane. Going aloft takes a proper bosun's chair or climbing harness, a halyard you've inspected, and a second line or person tending a backup; never go up on a boat still on stands unless the yard allows it. Watch for overhead power lines whenever a mast is moving. After launch, check every through-hull and hose for leaks right away; if water comes in faster than you can stop it, call the Coast Guard on VHF 16 or 911, or the yard if you're still at the lift.
Owners often ask
- What should I check on my sailboat rigging before the mast goes back up in spring?
This guide walks you through it. Still stuck? Ask the AI Mechanic about your engine.
Tools
- Your fall "remove before start" list and photos
- Binoculars (for checking the rig from deck)
- Basic hand tools, rigging tape, cotter pins or rings
- Rig tension gauge if you tune the rig yourself
- Multimeter, flashlight or headlamp
- Garden hose (for deck-leak and freshwater checks)
- Bucket, sponges, rags, nitrile gloves
Parts & supplies
- Raw-water impeller and pump gasket (if removed for winter)
- Zincs/anodes for the shaft, saildrive or heat exchanger as needed
- Bottom paint and supplies, if due
- Flares, inflatable life jacket rearming kits and first aid items to replace expired ones
- Spare hose clamps, wooden bungs for each through-hull
Before you start
Start with your fall list. Everything you removed, plugged or drained last fall (impeller, intake bags, drain plugs, halyards, batteries) has to go back. If you used the BoatMend sailboat winterizing guide, your list is ready.
Split the work into "ashore" and "afloat." Practical Sailor's spring checklist suggests approaching the boat like a hired inspector, and some items can only be checked hauled out. SpinSheet notes many jobs suit cool weather while bottom painting needs warmer days (it mentions temperatures above 50°F; check your paint's label), so plan around the forecast.
Book the crane early if your mast was unstepped. Use the time before stepping for rig work at ground level.
New-to-you boat, or no fall list? A BoatUS editor who bought a used 45-footer suggests:
- Go over the boat slowly with a notepad and light, even if you saw it during the survey, and list every system.
- If you can't tell whether a cheap job was done (an oil change, the anodes), do it again. The cost is small compared with guessing wrong.
- Check the previous owner's logs, draw a fuel sample if you can, and start the season with an empty, rinsed holding tank.
- Reread the Coast Guard carriage rules for your boat's length. A bigger boat may need more extinguishers, different placards, a different sound signal, and (39 feet and up) a printed copy of the Navigation Rules aboard.
- Note new tools and spares the boat needs: different socket sizes, filter types or systems you didn't have before.
- Put surveyor, insurer and safety items at the top of the list, then group the rest by material or mess (all the sealant jobs together, all the plumbing together) to save trips to the store.
Steps
With the mast on horses, check everything you can't easily reach later. BoatUS's sailboat list: inspect swage fittings for cracks and heavy rust, check wire halyards and running backstays for "fishhooks" (broken strands) and rust, and make sure masthead sheaves and blocks turn freely. Practical Sailor adds spreader tips (wire secured, chafe boots in place), cracked terminals, and cotter pins or rings taped or guarded. Look at mast wiring and lights now. Any crack in a fitting is a replace-before-launch item. See the rigging inspection guide.
A surveyor's photo trick: in BoatUS's 2026 rigging article, a marine surveyor suggests polishing each terminal with a Scotch-Brite pad, looking at it with a magnifying glass, then taking a close-up phone photo of every fitting, noting which one it is. Zoomed in on a laptop at home, hairline cracks are much easier to spot. Pay special attention to the spot where the wire enters the terminal (broken strands show up there), bent or stretched fittings, elongated pin holes, and split locknuts. A crack running around a fitting (from metal fatigue) is even more serious than one running lengthwise.
Photo: Sastognuti / Wikimedia Commons · CC BY-SA 3.0 BoatUS says to remove old tape from turnbuckles, lubricate the threads, then retape so water can still drain out. SpinSheet says to check chainplates for rust, pitting and cracks, and to look below deck too: water stains at a chainplate's base mean a leak and possible hidden corrosion. BoatUS adds that if you suspect the core around a chainplate is damp, the chainplate should come out for inspection and repair. The same surveyor explains why: stainless steel needs oxygen to keep its protective film, so the part of a chainplate sealed inside a wet deck can corrode badly while the visible parts above and below deck look perfect. Rust streaks running from a chainplate or fitting are a warning sign, and painting over chainplates only hides it.
Step the mast with the yard crane or your own gin pole system (see the mast stepping guide), pin everything, and connect the wiring. SpinSheet says to tune the rig using your boat's tuning guide. Practical Sailor's check: under way in a good breeze, leeward shrouds shouldn't go completely slack and the mast should stay straight with no pumping. Westerbeke notes that engine alignment to the prop shaft should be checked after launch with the mast stepped and rigging tuned, because rig loads can change the hull's shape slightly.
Reeve halyards and lines using last fall's messenger lines. SpinSheet says to check every sheet and halyard for wear, UV damage and even animal damage, and to look in sail bags for critters that spent the winter there. Bend on the sails on a calm day, check stitching, batten pockets and the furler, and make sure the furling line wraps cleanly. See the sail care, running rigging and roller furler guides.
SpinSheet and Practical Sailor both list deck hardware: blocks, tracks, cleats, stanchions, lifelines and pulpits. Look for spider cracks around fasteners (a sign of movement and possible leaks). Practical Sailor suggests servicing winches that haven't been opened in years; see the winch service guide. BoatUS suggests hosing hatches and ports to find deck leaks and renewing sealant where needed.
Look over the hull for blisters, cracks and damage. Practical Sailor says to check the keel joint and keel bolts for leaks, rust weeps or cracks, and look for grounding damage on the keel's leading edge and bottom. BoatUS's list includes gripping the prop to feel for a worn shaft bearing, checking the rudder stock and steering for play, and making sure the stuffing box is adjusted (it should drip no more than two or three drops a minute when the shaft turns). Replace zincs, clean the prop and paint the bottom if due. See the bottom paint, anode and cutless bearing guides.
BoatUS says to work every seacock, check hoses for stiffness, rot or cracks, look for rusty clamps, and tie a correctly sized wooden bung to each valve. It also recommends double clamping below the waterline where possible, as Practical Sailor's checklist does. Reinstall any drain plugs you pulled. See the seacocks and through-hulls guide.
On a saildrive, check the leg's oil level and color (milky means water got past a seal), the hull seal (diaphragm) for cracks or damage, and the anode. Follow your drive maker's seal-replacement schedule; see the saildrive care guide. Any doubt about the seal is a pro job before launch.
Work through your "remove before start" list: refit the raw-water impeller and gasket, remove intake and exhaust plugs, reconnect the shaft coupling if it was split, check belts, hoses and clamps. SpinSheet says to change the oil and filter now if you didn't in the fall, replace the fuel filters if due and check belt tension. Open the raw-water seacock before starting, and confirm water flows from the exhaust within seconds, as the USCG CO checklist says. Run the engine until warm, watch for leaks and check temperature. See the diesel raw-water impeller and engine alignment guides.
Right after launch, before the slings go slack, check every through-hull, the stuffing box or dripless seal, the saildrive seal and the engine hoses. BoatUS also says to check through-hulls for leaks after launch. Burp a dripless shaft seal if your seal maker calls for it.
SpinSheet says to flush the antifreeze out of the freshwater system and fill with fresh water. Run every faucet until the water runs clear, refill and sanitize the tank as the freshwater winterizing guide shows. Practical Sailor's check: does the pressure pump cycle with nothing open? That's a leak. Flush the head, check for leaks at hoses and fittings, and make sure the holding tank vent and Y-valve are set correctly.
Reinstall and charge batteries, clean and tighten connections (BoatUS says to clean both ends of the battery cables). Practical Sailor suggests checking that battery positives are covered and every circuit is protected by a fuse or breaker. SpinSheet says to power up electronics and test the chartplotter. Do a radio check on a working channel, not channel 16, and confirm the MMSI is programmed (BoatUS). Turn on the navigation lights at dusk. Inspect the shore power cord and inlet for burn marks (BoatUS).
BoatUS and SpinSheet: check fire extinguishers, flare dates (BoatUS notes pyrotechnic flares expire 42 months after manufacture), life jackets for each person, and inflatable life jacket cylinders and auto-inflators. Practical Sailor adds harnesses and tethers, the LifeSling or throwable, and smoke and CO alarms. Restock the first aid kit. Check registration for the boat and dinghy. A free Vessel Safety Check is a good final step.
Pick a light-air day and stay close to home. Check the engine under load, shifting forward and reverse, and the bilge after an hour of running. Raise every sail, furl and reef, and watch the rig under load for slack leeward shrouds or a mast out of column. Listen for new noises and check the stuffing box, saildrive seal and through-hulls once more back at the dock. The sea trial guide has a fuller checklist.
Common mistakes
- Stepping the mast before inspecting the masthead and spreaders, then paying to go aloft later.
- Starting the engine with the seacock closed or the impeller still on the workbench.
- Leaving old turnbuckle tape on, or retaping so water can't drain.
- Skipping the post-launch leak check while the boat is still in the slings.
- Forgetting the drain plugs, intake bags or rags listed in the fall.
- Not rechecking engine alignment after the boat settles and the rig is tuned.
- Expired flares and unarmed inflatable life jackets aboard on opening day.
When to call a pro
- Cracked swage fittings, chainplates or a damaged mast step
- Damp core around chainplates or deck hardware
- Keel bolt weeping, a cracked keel joint or grounding damage
- Milky saildrive oil, a damaged saildrive seal or a shaft seal that won't stop leaking
- Engine alignment and shaft coupling work if you've never done it
- A periodic professional survey: Practical Sailor suggests hiring a surveyor every 5 to 10 years to catch what you miss (your insurer may require one), and a rigger for any doubt aloft
Tips
- Keep the fall and spring checklists together in your BoatMend log so nothing gets missed.
- Do ground-level rig work while the mast is down; it's the cheapest time.
- Carry a spare impeller, belts and fuel filters aboard from day one.
- Photograph the rig tuning (turnbuckle thread showing) once it's right.
Official references
We read these to write this guide. Your engine's own manual always wins.
- BoatUS – Time-Tested Spring Boat Launch Checklist (with sailboat rigging section)
- Practical Sailor – Spring Inspection Checklist for Boats
- SpinSheet – Sailboat Spring Commissioning Checklist
- Westerbeke – Maintenance and Use FAQs (lay-up, shaft coupling and alignment after launch)
- USCG Boating Safety – Carbon Monoxide Checklist
- BoatUS – Spring Commissioning (when you don't have a list)
- BoatUS – Keep Your Rig Standing (2026)
Safety: BoatMend is for information only and does not replace a certified marine technician. You are responsible for your safety and your boat. Read the full disclaimer.
Last updated 2026-10-25
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