"We will see about the weather" is the sentence that costs the most on a rainy day. An outdoor wedding, a garden ceremony, cocktails under the trees, dinner on a terrace, needs a concrete backup plan, not a vague intention to "move inside if needed."
What a real backup plan must cover
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Covered space with real seated capacity for ALL guests, not just part of them
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A tent or marquee booked and confirmed, not "we can find one last minute"
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Walkable ground in case of rain (tarp, flooring) if the fallback is on grass
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Extra heating if the fallback is an uninsulated tent, especially in May or September
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A plan for photos if the grounds become unusable
The real cost of an improvised backup plan
Renting a tent 48 hours before the wedding often costs double an early booking, and only if a rental company still has stock during peak season. Many do not. The backup plan needs to be budgeted and booked alongside the main plan, not after it.
If your venue has an indoor fallback room, check its real capacity for a seated dinner, not just its standing cocktail capacity. A room that "holds 150 people standing" might only seat 80.
A realistic decision timeline
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15 days before: confirm the fallback (tent, room) is booked and paid for
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3 days before: first serious weather check, notify the caterer of a possible switch
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1 day before: near-final decision with key vendors (caterer, DJ, florist)
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Morning of: final call before setup, communicated to the whole team
Briefing vendors ahead of time
The caterer, florist, and DJ need to know the backup plan before the day, not discover it on site. An outdoor setup and an indoor setup do not need the same equipment or setup time. Ask each vendor how long they need to switch plans, and time the final decision around that window.
A successful outdoor wedding is not one where it happened to be sunny. It is one where rain, if it comes, changes nothing about the mood because everything was already planned.