Frost Dates for Tri-Cities, WA

Based on data from Pasco Tri Cities AP weather station, 4 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 27
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 11
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost May 2
First Fall Frost October 4

Hard Freeze (28°F)

Last Spring Hard Freeze April 7
First Fall Hard Freeze October 23
46.25°N, -119.20°W © OpenStreetMap

Growing Season

167 Days April 27 to October 11

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 7a

Avg. annual minimum: 0 to 5°F (−18 to −15°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

BWk Cold Desert

Dry with hot summers and cold winters. Rainfall is minimal year-round. Short growing seasons and large temperature swings require careful timing. Cold-hardy, drought-tolerant plants are best suited.

Köppen climate map

Temperature

20° 40° 60° 80° 100°
35°
High: 41°F
Avg: 35°F
Low: 28°F
Jan
38°
High: 49°F
Avg: 38°F
Low: 28°F
Feb
46°
High: 59°F
Avg: 46°F
Low: 33°F
Mar
53°
High: 67°F
Avg: 53°F
Low: 38°F
Apr
61°
High: 77°F
Avg: 61°F
Low: 46°F
May
68°
High: 83°F
Avg: 68°F
Low: 53°F
Jun
75°
High: 93°F
Avg: 75°F
Low: 57°F
Jul
73°
High: 91°F
Avg: 73°F
Low: 56°F
Aug
64°
High: 81°F
Avg: 64°F
Low: 48°F
Sep
52°
High: 66°F
Avg: 52°F
Low: 38°F
Oct
41°
High: 50°F
Avg: 41°F
Low: 32°F
Nov
34°
High: 41°F
Avg: 34°F
Low: 27°F
Dec
32°F
28°F
Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)

Precipitation

0" 1" 1.9"
1.8"
1.82"
Jan
1.6"
1.55"
Feb
1.9"
1.86"
Mar
1.6"
1.58"
Apr
1.8"
1.76"
May
1.6"
1.63"
Jun
0.1"
0.08"
Jul
0.0"
0.00"
Aug
0.8"
0.79"
Sep
1.8"
1.84"
Oct
1.3"
1.34"
Nov
1.8"
1.83"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h15h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:36 AM – 4:24 PM · 8h 48m
Feb: 6:57 AM – 5:03 PM · 10h 06m
Mar: 6:12 AM – 5:48 PM · 11h 36m
Apr: 5:20 AM – 6:40 PM · 13h 20m
May: 4:37 AM – 7:23 PM · 14h 47m
Jun: 4:13 AM – 7:47 PM · 15h 34m
Jul: 4:23 AM – 7:37 PM · 15h 15m
Aug: 5:01 AM – 6:59 PM · 13h 59m
Sep: 5:51 AM – 6:09 PM · 12h 19m
Oct: 6:41 AM – 5:19 PM · 10h 39m
Nov: 7:25 AM – 4:35 PM · 9h 10m
Dec: 7:47 AM – 4:13 PM · 8h 26m
Daylight Longest: 15h 36m · Shortest: 8h 24m

Nearby Stations

Kennewick, WA March 28 - October 30 Richland, WAApril 6 - October 24 Sagemoor, WAApril 30 - October 13 Eltopia 8 Wsw, WA April 21 - October 22 Ice Harbor Dam, WA April 7 - October 22 Mcnary Dam, WA March 27 - November 4

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview