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High Tide Square – Afghan Square Crochet Pattern

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Diagonal double crochet waves traced with surface crochet are surrounded by a thick border in this striking crochet block. The High Tide Square is suited for crocheting in a single color, or in many colors. See what combinations you can come up with and create and entire blanket, or choose just your favorite and combine it with other crochet square patterns.

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Want more fun news?

The High Tide Square is block number 1 of the 2025 Moogly Blanket Crochet Along! You can find the post for the 2025 Moogly CAL HERE.

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High Tide Square

Crochet Pattern
Intermediate Skill Level
Designed by Jessie Rayot

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Supplies & Stats

Size

12” x 12”

Yarn

Caron One Pound: (100% Acrylic), Size 4 – Medium/Worsted/Aran, 812 yds / 454 g, (1.79 yds/g)
Samples made with: 10654 Dijon, 19655 Succulent and 19639 Canal

Crochet Hook

US J/10 (6.0 mm)

Gauge

Learn about gauge HERE
12 sts x 7 rows = 4” [10 cm] in dc

Other Supplies

Yarn Needle
Removable Stitch Markers (3)

Stitches and Abbreviations

click on highlighted sts for tutorials

ch – chain
dc – double crochet
dc3tog – double crochet 3 together
dch2 – double chain 2
fdc3tog – foundation double crochet 3 together
fdc – foundation double crochet
rnd – round
sc – single crochet
sl st – slip stitch
sp(s) – space(s)
st(s) – stitch(es)
yo – yarn over
( ) – work step in parentheses in indicated stitch
[ ] – work step in brackets number of times indicated

Special Stitches

double crochet 3 together (dc3tog): Yo, insert hook in st, yo, pull up a loop (3 loops on hook), yo, pull through 2 loops (2 loops on hook), [yo, insert hook in next st, yo, pull up a loop, yo, pull through 2 loops] 2 times, (4 loops on hook), yo, pull through 4 loops.

double chain 2 (dch2): Insert hook in st, yo, pull up a loop (2 loops on hook), yo, pull through both loops, insert hook in left (right if left-handed) vertical loop of st part just made, yo, pull up a loop (2 loops on hook), yo, pull through both loops.

foundation double crochet 3 together (fdc3tog): Yo, insert hook in st, yo, pull up a loop, yo, pull though 1 (chain made, pm around ch), yo, pull through 2, *yo, insert hook through marked ch, [yo, pull though 1] 2 times (chain made, pm around ch), yo, pull through 2; repeat from * once more, (4 loops on hook), yo, pull through all.

foundation double crochet (fdc): Yo, insert hook in st, yo, pull up a loop, yo, pull though 1 (chain made, pm around ch), [yo, pull through 2] 2 times.

Pattern Notes

  • Read through all instructions before beginning.
  • The stitch count is at the end of each rnd/row after the period, usually only if the count has changed from the previous rnd/row. [count here]
  • Chs and sl sts are not included in stitch counts unless specified.
  • This square will need to be blocked – it will have a diagonal pull, which is fixed with blocking.
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High Tide Square Afghan Square Pattern

Increase Section

Row 1: Ch 2, (dch2, dc, ch 2, 2 dc) in first ch made. [4 sts]

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Row 2: Turn, dch2 in first st, dc in next st, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 2 sts. [8 sts]

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Row 3: Turn, dch2 in first st, dc in each of next 3 sts, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 4 sts. [12 sts]

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Row 4: Ch 7, turn, (dch2, dc, ch 2, 2 dc) in last ch made, dc in each of next 3 chs, dc3tog 2 times, dc in each of next 3 sts, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog, fdc3tog in last st of previous row, 4 fdc, (dc, ch 2, 2 dc) in bottom of last fdc made. [28 sts]

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Row 5: Turn, dch2 in first st, dc in next st, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * once more, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 2 sts. [32 sts]

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Row 6: Turn, dch2 in first st, dc in each of next 3 sts, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * once more, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 4 sts. [36 sts]

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Row 7: Ch 7, turn, (dch2, dc, ch 2, 2 dc) in last ch made, dc in each of next 3 chs, dc3tog 2 times, dc in each of next 3 sts, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * once more, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog, fdc3tog in last st of previous row, [fdc in marked ch] 4 times (dc, ch 2, 2 dc) in bottom of last fdc made. [52 sts]

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Video – High Tide Square Increase Section Right Handed

Video – High Tide Square Increase Section Left Handed

Decrease Section

Row 1: Ch 1 (does not count as a st), turn, sl st in each of first 2 sts, (sl st, dch2) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * 2 more times, dc in ch-2 sp. [46 sts]

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Row 2: Turn, dch2 in first st, dc in next st, dc3tog 2 times, dc in each of next 3 sts, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * once more, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 2 sts. [42 sts]

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Row 3: Turn, ch 2 (does not count as a st), dc6tog, dc in each of next 3 sts, *(2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts; repeat from * once more, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc6tog. [36 sts]

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Row 4: Ch 1 (does not count as a st), turn, sl st in each of next 6 sts, (sl st, dch2) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 3 sts, dc in ch-2 sp. [22 sts]

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Row 5: Turn, dch2 in first st, dc in next st, dc3tog 2 times, dc in next st, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in next st, dc3tog 2 times, dc in each of next 3 sts, dc3tog 2 times, dc in each of next 2 sts. [18 sts]

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Row 6: Turn, ch 2 (does not count as a st), dc6tog, dc in each of next 3 sts, (2 dc, ch 2, 2 dc) in ch-2 sp, dc in each of next 3 sts, dc6tog. [12 sts]

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Fasten off.

NOTE: If you want to block at this point, block the square to 9″. You will still need to block the square again when it’s complete.

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Video – High Tide Square Decrease Section Right Handed

Video – High Tide Square Decrease Section Left Handed

Border

Rnd 1: Attach yarn to ch-2 sp of Row 6, ch 3, [sc 29 evenly along side of square, ch 2] 3 times, sc 29 evenly alone side of square, sl st in beginning ch-3 sp to join. [29 sc on each side]

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Rnds 2-5: Ch 3, sc in same ch-2 sp, *sc in each st to next ch-2 sp, (sc, ch 2, sc) in ch-2 corner; repeat from * 2 more time, sc in each st to ch-2 sp, sc in ch-2 sp, sl st to beginning ch-3. [37 sc on each side]

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Video – High Tide Square Border Right Handed

Video – High Tide Square Border Left Handed

Surface Crochet

  • Sl st on RS along top of first row of Square, and every other row after.
  • Sl st below Rnd 1 of Border and on top of Rnds 2 & 4 of Border.
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Video – High Tide Square Surface Crochet Right Handed

Video – High Tide Square Surface Crochet Left Handed

Finishing

  • Weave in all ends
  • Steam or wet block to get square corners
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Happy Stitching!

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© Copyright 2025 Jessie Rayot / Jessie At Home®, LLC All my videos, patterns, charts, photos and posts are my own work, so you may not copy them in any way. If you want to share this information with someone, then share the link to this post. If you want to share on your own blog / website, then you may use the first photo in this post and link back to this post. Also, you may not give away printed copies of this post.

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