Hillsboro and Beaverton, OR frost dates and planting calendar

West-side valleys. The Willamette Valley, Puget Sound and southern Oregon valleys. Long frost-free seasons, but soil stays cold and wet into May, so warm crops wait for warm soil, not just the last frost.

Frost dates are 1991–2020 NOAA climate normals for Portland-Hillsboro Airport (62 m elevation). Gardens in cold hollows or at higher elevation can frost later in spring and earlier in fall.

What to plant now

Make a garden plan for Hillsboro and Beaverton Pick your plants and get a dated, printable to-do list.

Planting calendar

Planting dates for Hillsboro and Beaverton

Crop	Start seeds indoors	Plant in the garden	Plant again for fall
PeasPlant seeds in the ground	—	Mar 5 – Apr 16	—
RadishesPlant seeds in the ground	—	Mar 5 – Apr 30	Sep 3–17
SpinachPlant seeds in the ground	—	Mar 5 – Apr 9	Aug 20 – Sep 10
LettucePlant seeds or young plants	Jan 22 – Feb 5	Mar 5 – Apr 30	Aug 20 – Sep 3
OnionsPlant small onion bulbs (sets)	—	Mar 5 – Apr 9	—
CarrotsPlant seeds in the ground	—	Mar 19 – May 14	Jul 23 – Aug 6
BeetsPlant seeds in the ground	—	Mar 19 – May 14	Aug 6–20
KalePlant young plants (starts)	Feb 5–19	Mar 19 – Apr 30	Aug 6–20
BroccoliPlant young plants (starts)	Jan 29 – Feb 12	Mar 19 – Apr 23	Jul 23 – Aug 6
CabbagePlant young plants (starts)	Jan 29 – Feb 12	Mar 19 – Apr 23	Jul 23 – Aug 6
Swiss chardPlant seeds in the ground	—	Mar 19 – May 14	Aug 6–20
PotatoesPlant seed potatoes	—	Mar 19 – Apr 30	—
Bush beansPlant seeds in the ground	—	May 10 – Jun 21	—
Sweet cornPlant seeds in the ground	—	May 10 – Jun 14	—
CucumbersPlant seeds or young plants	Apr 12–19	May 10 – Jun 7	—
Zucchini and summer squashPlant seeds or young plants	Apr 12–19	May 10 – Jun 7	—
Winter squash and pumpkinsPlant seeds or young plants	Apr 12–19	May 10–31	—
TomatoesPlant young plants (starts)	Mar 15–29	May 10 – Jun 7	—
PeppersPlant young plants (starts)	Mar 1–15	May 10–31	—
BasilPlant young plants (starts)	Mar 29 – Apr 12	May 10 – Jun 7	—
DahliasPlant tubers	—	May 10 – Jun 7	—
CilantroPlant seeds in the ground	—	Mar 5 – Apr 23	Aug 27 – Sep 10
ParsleyPlant seeds or young plants	Jan 22 – Feb 5	Mar 19 – May 7	—
DillPlant seeds in the ground	—	Mar 19 – May 21	—
StrawberriesPlant young plants	—	Mar 19 – Apr 30	—
BlueberriesPlant potted or bare-root bushes	—	Mar 19 – May 7	—
RaspberriesPlant bare-root canes	—	Mar 19 – Apr 30	—
GarlicPlant cloves	—	—	Oct 1 – Nov 15
CauliflowerPlant young plants (starts)	Jan 29 – Feb 12	Mar 19 – Apr 16	Jul 16–30
Brussels sproutsPlant young plants (starts)	Jan 22 – Feb 5	Mar 19 – Apr 30	—
LeeksPlant young plants (starts)	Jan 8–22	Mar 19 – Apr 30	—
ArugulaPlant seeds in the ground	—	Mar 5 – Apr 16	Aug 27 – Sep 17
Bok choyPlant seeds or young plants	Jan 29 – Feb 12	Mar 5 – Apr 9	Aug 20 – Sep 3
TurnipsPlant seeds in the ground	—	Mar 5 – Apr 16	Aug 13–27
KohlrabiPlant seeds or young plants	Feb 5–19	Mar 19 – Apr 30	Aug 13–27
EggplantPlant young plants (starts)	Mar 1–15	May 10–31	—
MelonsPlant seeds or young plants	Apr 12–19	May 10–31	—
Pole beansPlant seeds in the ground	—	May 10 – Jun 14	—
Fava beansPlant seeds in the ground	—	Mar 5 – Apr 9	—
ShallotsPlant bulbs	—	—	Oct 1 – Nov 15
AsparagusPlant dormant crowns	—	Mar 19 – Apr 30	—
RhubarbPlant dormant crowns	—	Mar 5 – Apr 16	—
ChivesPlant seeds or young plants	Jan 22 – Feb 5	Mar 19 – May 14	—
MintPlant young plants	—	Mar 19 – May 14	—
RosemaryPlant young plants	—	Mar 19 – May 7	—
ThymePlant young plants	—	Mar 19 – May 14	—
OreganoPlant young plants	—	Mar 19 – May 14	—
SunflowersPlant seeds in the ground	—	May 10 – Jun 21	—
Sweet peasPlant seeds in the ground	—	Mar 5 – Apr 9	—
TulipsPlant bulbs	—	—	Oct 1 – Nov 15
DaffodilsPlant bulbs	—	—	Oct 1 – Nov 15

Dates are a guide, not a guarantee. Check the soil before planting: cool-season crops need it workable and not soggy; warm-season crops need it warm. A $10 soil thermometer pays for itself. Unfamiliar terms are explained in the glossary.

Nearby areas with similar weather

• Portland, OR
• Gresham, OR
• Wilsonville and Canby, OR
• Oregon City and West Linn, OR
• St. Helens and Scappoose, OR
• Salem, OR

All Oregon and Washington cities or use the planner with your ZIP.