Frost dates / Oregon / Medford

Frost dates in Medford, OR

The station on this page is MEDFORD ROGUE VLY AP, OR US (USW00024225), 3.3 miles from the city point. Population in the Census 2024 estimate is 86,301.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 97504 (2.8 miles from the city point used on this page).

Median last 32°F is April 8. Median first 32°F is October 29. The 50% growing-season length is 204 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	March 17	Earlier date. A last 32°F on or after this day is common.
50%	April 8	Median.
10%	April 30	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	October 14	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 29	Median.
90%	November 16	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	232
50%	204
90%	176

28°F threshold

	10%	50%	90%
Last, on or after	April 3	March 10	February 16
First, on or before	October 26	November 13	December 9
Season at least	283 days	247 days	212 days

36°F threshold

	10%	50%	90%
Last, on or after	May 17	April 30	April 11
First, on or before	October 3	October 16	October 29
Season at least	189 days	167 days	148 days

Station MEDFORD ROGUE VLY AP, OR US (USW00024225). Completeness flag S, 26 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 395.3 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Medford, OR

Zone 8bAverage annual extreme minimum 15°F to 20°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Oregon. Nearest qualified station: MEDFORD ROGUE VLY AP, OR US (USW00024225), 3.3 miles. Median last 32°F April 8. Median first 32°F October 29. The 50% growing-season length is 204 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 30	April 8	March 17
First 32°F on or before	October 14	October 29	November 16

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Oregon are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

Date checks use your device’s calendar and appear after the page loads.