Earth Day Fill In Puzzle

Celebrate Earth Day 2026 with a free printable Earth Day fill in puzzle for upper elementary and middle school students.

If you need a simple, no-prep activity that actually keeps kids focused, this printable puzzle is an easy win.

Kids will be challenged to fit all 35 Earth Day themed words into the word puzzle.

The fill in word puzzle makes an educational and fun indoor Earth Day activity. It’s free to download and print.

What is a Fill in Puzzle?

A fill in word puzzle is a word game where kids place given words into a grid based on letter length instead of solving clues.

A fill in puzzle is similar to a crossword puzzle, except instead of being given a clue, the puzzle’s words are given from the start. The challenge is fitting all the given words into the puzzle.

The words of the puzzle are organized based on the number of letters.

A 5 letter word can only be written in a word box meant for 5 letters. So all the puzzle’s words can fit in, usually only one spot will work for each word.

Difficulty Level

Although the vocabulary is more advanced, the puzzle’s difficulty level is not hard.

It’s a fun puzzle kids are sure to enjoy. It’s meant for students in upper elementary and middle school.

This word puzzle complements the 6th grade Earth Day themed spelling list. Twelve of its words are included in this puzzle.

Most of the remaining words are previously learned spelling words from earlier grades. That makes this puzzle a perfect spelling activity for grade 6 students.

Earth Day Words

This printable fill in word puzzle has 35 Earth Day vocabulary words about helping and protecting the environment. Words like:

• biodegradable
• compost
• conservation
• ecology
• environment
• oceans
• recycle

It has 4 letter words all the way up to 13 letter words.

How Do Kids Solve a Fill In Puzzle?

Start with the easiest spot

A simple way to start is by looking for the group of words with the fewest options.

For example, if there is only one 11-letter word, find the space in the puzzle that has 11 boxes. That gives you a clear starting point since only one word can fit there.

Work outward from there

Once that word is placed, look at the words that connect to it. Each intersecting word will now have one letter filled in, which helps narrow down the possibilities.

From there, keep working outward:

• Look at how many letters each word has
• Use any known letters from intersecting words
• Check which word fits both the length and the letter placement

Look for easy wins in the grid

Another helpful approach is to look over the puzzle and notice what stands out as having fewer possible options.

Instead of following a strict rule, take a moment to scan the grid and the word list. Some spots will naturally be easier to figure out because there are fewer words that could fit.

In this puzzle, you’ll likely notice that the longer words tend to have fewer possible spaces. That makes them a good place to focus, since there’s a higher chance only one word will fit.

Use intersecting letters

You can also look for places where words intersect in a helpful way.

A good place to check is where words cross at the first or last letter. These spots are often easier because you don’t need to count every space, you can quickly scan the word list to see what fits.

For example, if a word ends where another word begins, you can compare the possible words to see which letters match in that spot.

If only one pair of words fits both the length and the crossing letter, you’ve likely found the correct placement.

This is especially helpful when two longer words cross each other, since there are often fewer possible combinations to test.

Example from this puzzle

For example, in this puzzle there are two 12-letter words: CONSERVATION and REUSABLE BAGS.

We can see from the puzzle grid that one word ends with the 4th letter of the other. All you have to do is check which combination fits.

• CONSERVATION has an S as the 4th letter
• REUSABLE BAGS ends with an S

That match tells you exactly where both words go.

Keep going

From there, keep building outward one word at a time. Each correct answer makes the next one easier to figure out.

Download and Print

To get your free printable, use either form below, and the Earth Day fill in word puzzle will be automatically sent to your email.

The PDF includes an answer page. Print page 1 to only print the puzzle page.

The puzzle prints in black and white to keep printing costs low.

More Earth Day Printable Activities

Here are more free printable Earth Day word puzzles for kids:

• 6th grade word search
• an Earth Day crossword puzzle with 5th grade spelling words
• easy word search for kids around 1st or 2nd grade
• save planet Earth word puzzles and spelling games where kids will learn the vocabulary and to read, write, and spell 35 Earth Day words.

Earth Day Word Puzzle Answer Key

Here is the answer key for this Earth Day puzzle. The answers are also included in the downloaded pdf.

You can find more printable Earth Day activities here.