Seasonal depression:
why October is the time to start treatment

For some people, the shift is unmistakable. The light gets shorter in October, and within weeks the energy drains out of everything. Sleep gets heavier, motivation disappears, and the same dread arrives that came last year, and the year before. Then spring comes, and it lifts, until fall circles back around.

If that pattern sounds like your life, it has a name: seasonal affective disorder (SAD), a form of depression whose episodes track a specific time of year, most often fall and winter, with full remission in spring or summer. In Northern Virginia, where the daylight noticeably shortens through the fall, this is a real and recurring pattern for many adults.

Why this one is different: you can see it coming

Most depression is unpredictable. Seasonal depression is not, and that predictability is a clinical advantage. Because a SAD diagnosis requires the same pattern for at least two consecutive years, you and your provider can often anticipate the next episode and act before it fully arrives.

That is the whole point of this article: if your depression is seasonal, the smartest time to treat it may be before it starts, not after it has already flattened you.

The strongest evidence for prevention: starting early

For people with a history of SAD, the medication with the strongest evidence for prevention is bupropion (Wellbutrin). In a Cochrane review, starting bupropion between September and November, before symptoms recur, significantly reduced the number of people who developed a winter depressive episode (relative risk 0.56; 95% confidence interval 0.44 to 0.72).

That timing is the key. It is why a conversation in early fall is worth far more than one in the depths of January.

First-line treatments for seasonal depression

Guidelines recommend light therapy, antidepressants, cognitive behavioral therapy (CBT), and lifestyle changes, alone or in combination.

• Light therapy. Typically 2,500 to 10,000 lux for 30 to 60 minutes each morning, shortly after waking, using a light box designed for SAD. It is very low risk overall, but people with certain eye conditions or on light-sensitizing medications may benefit from an eye exam first. Starting light therapy early in a season, or at the first sign of symptoms, may help prevent a full episode.
• Antidepressants (SSRIs). Effective first-line agents for SAD, used alone or with light therapy.
• CBT. A structured therapy that builds durable skills for managing the seasonal dip.
• Lifestyle. More exercise and more exposure to natural daylight are recommended alongside other treatments.

Why October is the right time to act

If you wait until you are already in the fog, treatment still works, but you have spent weeks or months suffering that a fall plan might have prevented. Because effective medications and light therapy can take a few weeks to reach full effect, getting a plan in place now means protection is already active when the darkest weeks arrive.

Frequently Asked Questions

When should I start treatment for seasonal depression?

Before symptoms return. For people with a history of seasonal affective disorder, starting bupropion between September and November, before the episode begins, significantly reduced the number who developed a winter depression in a Cochrane review. Light therapy started early in the season may also help prevent a full episode.

Does light therapy work for seasonal affective disorder?

Yes. Light therapy is a first-line treatment: typically 2,500 to 10,000 lux for 30 to 60 minutes each morning shortly after waking, using a light box designed for SAD. It is low risk overall; people with certain eye conditions or on light-sensitizing medications may benefit from an eye exam first.

How is seasonal depression diagnosed?

It is a form of major depression whose episodes track a specific season, most often fall and winter, with full remission in spring or summer, and the pattern has to have occurred for at least two consecutive years. That predictability is what makes prevention possible.

Can I be seen in the fall to plan ahead?

Yes. Alice Tran Psychiatric Care sees adults in person in Fairfax and by secure video across Virginia, and a fall planning visit is a reasonable use of an initial evaluation for anyone whose mood reliably drops with the shorter days.

See also: Seasonal Affective Disorder: More Than the Winter Blues · Depression Treatment · Your First Appointment for Depression · Why Did My Depression Come Back?