Hummingbirds are very active and social. During the summer, they come to your backyard every day.

You can spend time looking at the little amazing birds that are flying around your backyard and enjoying the hummingbird feeders. Remember that those little birds are almost just as hot as you, so you must make sure that you keep your sugar water feeder filled and fresh!

You must adjust your care to the little birds based on how hot it is.

With the sun beating down on nectar, it can spoil faster than you might think. However, it is simple to keep your backyard visitors safe once you know when to change out the nectar.

The Exact Timeline for Warm Weather Refills

Clean your windows thoroughly before installing suction cup feeders – dirty glass is the main reason suction cups fail. Use warm water on both the window and suction cups for better adhesion, especially in cold weather.

Press firmly for several seconds when attaching. Clean feeders weekly with hot water and a bottle brush to prevent mold and bacteria buildup.

Replace nectar every 3-5 days in cool weather, every 1-2 days when temperatures exceed 80°F.

You might only need to change the food in your feeder once a week or so when it is cooler, perhaps even every 10 days in some areas. But mostly, you will have to change it more frequently – especially in warmer weather and when a feeder is placed in full sun.

High Temperature (°F)	When to Refill Nectar
70°F to 80°F	Every 3 to 4 days
81°F to 89°F	Every 2 to 3 days
90°F to 95°F	Every 2 days
96°F and above	Every single day

Why Nectar Spoils Faster in the Heat

Make sure your feeders are sparkling clean. During the summer, this might mean putting out a clean feeder every day.

Fresh sugar water solution spoils rapidly in the heat, causing mold and bacteria that can kill hummingbirds. If the nectar is cloudy, it’s spoiled–take it down immediately!

Signs It Is Time to Empty the Feeder

Several things can cause hummingbird nectar to spoil. The biggest culprits are molds, bacteria, and fungi.

You can often spot spoiled, moldy nectar with just a glance. The sugar water solution may turn cloudy, or you may notice mold or mildew growth at the feeder’s base.

Another concern is the presence of dead bugs in the feeder. You would not want to eat from a dish full of dead insects, and neither do hummingbirds!

If you notice bugs have died in the reservoir or base of the feeder, it’s time to dispose of the unclean hummingbird nectar, clean out the feeder reservoir, and add fresh nectar.

• Cloudy water: Fresh nectar is supposed to be crystal clear. When it looks foggy, it has begun to ferment.
• Black spots: Look at the feeding ports and the glass for little black specks. This is mold.
• Floating debris in the liquid, such as white strings or clumps, indicates bacterial growth.
• A yeasty or sour smell indicates spoilage, so if your feeder smells like that when you open it, dispose of it immediately.

Hot Weather Feeder Tips

Over the hot summer months, it is important to help hummingbirds in your garden with a feeder filled with cool nectar and make sure there are plenty of shade areas to help them beat the heat. Hot water and sugar solutions aren’t likely to be super attractive to your yard’s hummers.

They may stop once to check it out, but it’s not likely you’ll see them at the feeder again if the nectar inside is steaming hot.

First, try moving your feeder to a spot that gets afternoon shade. Keeping the glass out of direct sunlight buys you a little extra time.

Second, only fill the feeder halfway. Since you are changing the nectar every day or two in the heat, a full feeder just wastes sugar.

Finally, give the feeder a quick scrub with hot water and a bottle brush every single time you refill it. Skipping the cleaning step will make your fresh batch of nectar spoil much faster.

A Natural Backup Plan

Nectar: Nectar can come from two different places: flowers and feeders. Planting nectar-rich flowers is the best way to attract hummingbirds to your yard, but sugar water-filled feeders are a great backup plan.

Plants like cardinal flower, bee balm, and native salvias thrive in summer heat. Having a few of these in your yard means the birds will always have plenty to eat, even if you take your feeder down for a few days to take a break.

Enjoying Your Summer Visitors

Attracting hummingbirds to your yard can seem daunting and can be a little bit frustrating at times. However, with a couple of easy steps, you can increase your chances of enjoying these busy little birds throughout the summer months.

Warm-weather nectar refill times

Spec	What our writers say
Cool weather	Replace nectar every 3-5 days
Over 80°F	Every 1-2 days
Cooler weeks	Once a week, maybe every 10 days
Full sun	Change more often
Cloudy nectar	Spoiled; take it down immediately
Heat risk	Mold and bacteria in spoiled sugar water can kill hummingbirds
Dead bugs in the reservoir	Dump it, clean, and refill
Hot nectar	They may check once and not come back
Shade	Keeps nectar cooler and helps them beat the heat
Backup	Nectar-rich flowers first; feeders as backup

Keep reading

• 10 Common Hummingbird Feeding Mistakes (and How to Avoid Them)
• 8 Types of Hummingbird Feeders, Tested: Which Ones Actually Drip (And Which Don’t)
• 11 Bird Feeders Under $25 That Actually Last More Than One Season